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EMeyer last won the day on November 29 2019

EMeyer had the most liked content!

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About EMeyer

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  1. Im an SPS noob compared to many on the forum, but I'll chime in. Your parameters seem good to me. Happy to see an alkalinity near natural seawater, I think high alkalinity is one of the underappreciated coral killers in our hobby. The other ingredient that I havent seen mentioned yet is an established microbial community. IME most reef keeper find success with SPS in mature, established tanks with good microbial communities, while very few find success in recently established dry rock tanks. Thats certainly been the case for me.
  2. Good question, and thats why I havent started offering the eDNA test commercially yet. Sensitivity testing is hard when diseased fish are so hard to come by. The eDNA test uses a universal eukaryotic marker, so it picks up everything - fish, corals, snails, etc... and parasites. I've seen all the major parasites so far in one or more samples. Positives are easy - if it's detected, the disease is present in the tank. Since DNA data are digital, theres little or no uncertainty about a positive result. The harder part is negatives -- how confident can we be about a negative result? (This is not limited to eDNA or Ich testing, false negative rates are generally higher for all disease testing) Right now I can only say its pretty sensitive, in that it sometimes picks up parasite DNA in tanks without any fish showing symptoms. Sensitivity testing turns out to be hard, because either (a) diseased fish are much rarer in the hobby than I thought or (b) few hobbyists are willing to admit it when one of their fish gets disease symptoms.
  3. For whatever its worth, I don't consider vermetid snails a pest. As far as I can tell theyre ubiquitous in the hobby but have never been a problem in any of my tanks. The kind of suck when you poke yourself on them, but bristleworms have caused me 1000x the pain over the years. If we're gonna call any animal hitchikers a pest my money is on bristleworms (which I hate but also consider ubiquitous and inevitable) (Not to take away at all from your main question, we probably all consider ich a problem and don't want it in our tanks!) I think I'd agree with your premise that the presence of ich should be disclosed. I don't have ich in my tanks either symptomatically or based on eDNA sequencing. One of my display tanks does have uronema present without any fish deaths, and ich and velvet are both also detected in some samples, but I've never detected them in mine. If I found a known parasite like that in my frag tanks I'd probably feel like I had to disclose it or stop selling frags from that tank til it was cleared up.
  4. Hi everyone, All tests ordered this weekend are discounted by 25% -- https://aquabiomics.com/ (PS, for anyone who had difficulties browsing your results recently, I fixed the database bug and reports should be visible again) Have a great 4th! -Eli
  5. Just a 40 gal. I'm expanding my frag operation and just adding parts. Thanks for all the replies, some good success so far! Still looking for: 2-4 more MH lights (especially pendants) Shallow frag tanks (about 2x4 is ideal, but will consider other sizes)
  6. Hi all, I'm in the market for shallow frag tanks, a 40 breeder, and metal halides. Anyone got something like this taking up space in the garage? Send me a PM if so! Thanks, -Eli
  7. How are the frags and remaining colony doing? I have an experimental medication that specifically kills Vibrio, and have used it to save several Acro frags. For almost a year now I've used it on any acro that STN or RTN. It's saved most, including a few really extreme cases. It has to be used as a dip, which makes it tough for colonies. But great for frags. Message me if you want to give it a shot, I have a lot of it...
  8. I forgot, this forum never allows me to post images on the first try. Lets see if this fixed it.
  9. Hi all, I have a bunch of Melanarus Wrasses for sale (I have 13, and would like to get rid of at least 10). These fish are fat and happy, 2-3" long. They don't sit still very long so its hard to measure them. Each fish has been housed by itself for over 4 months, in an isolated tank that never housed any other fish. So these are pre-quarantined. They eat pellets or frozen food readily. $40 each, If you buy multiple I will make you a deal. I am no expert but based on the number of fish and the variation in markings I am pretty these include both males and females. I find wrasses impossible to photograph because the friggin things never sit still. But here are a couple images to prove I really do have them You'll find prettier pictures online, but the fish I have are just as colorful as any pictures I've seen online. Warning, they do eat small snails or hermits. Larger ones are fine but the little ones become tasty snacks.
  10. Looks like I'm finally ready to start this carbon dosing experiment. Its funny how much time maintenance and testing a little nano tank can take, when there are 12 of them. Decided to modify the treatments slightly, to range from less complex to more complex: ethanol ethanol, vinegar, & sugar my homebrewed DOC (a mixture of partially hydrolyzed polysaccharides) This will let me test whether a single carbon source leads to a bloom of one type, while a more diverse mixture promotes multiple blooms. Anyone think I should switch one of those first two for something else? Is there a different carbon source more widely used?
  11. Whoa, seasoned media and water from the famous SuncrestReef tank, awesome! Cant wait to see your next diversity score. If this follows similar dynamics as in my live rock study the community should be established within 2 weeks after putting the rock in the tank. You've got another sample kit in hand now, right? Thats an exciting experiment because it would be a nice answer for people who want live rock diversity but are concerned about hitchikers...
  12. Totally agree, I love these things. I also share your experience that they sometimes need to be calibrated when you first buy them, one of mine was off by over 1 degree C. But easy enough to check and adjust.
  13. Hi everyone, I've written up my experiments starting new aquariums with live rock or dry rock. I've previously described the chemistry part; in this article I analyze changes in the microbiome of these tanks. Here are some of the conclusions: The article is here. I'll be curious to hear what you think! -Eli
  14. So not only are your parameters rock solid between the two samples, there werent even any large water changes. This makes the changes in several major families in your tank even more interesting. Although theyre unexpected I am inclined to believe them, and only wonder why. For comparison here are some of the changes during establishment of an experimental tank with live rock. The samples are about a week apart. So at least for some tanks, microbiomes remain relatively stable and recognizably the same over this time scale. (None of which is to say this microbiome shown is in better health than yours; in fact yours is more similar to the typical community than this one). Even during the dynamic early days of establishing a new tank. And a figure I've shown before, demonstrating that duplicate samples taken at the same time (A1 and A2) produce nearly identical results. So I think its unlikely the differences result from random errors in estimating the community. So I'm stumped what caused the change but inclined to believe it is a real change in those families... You havent changed anything, and your measured parameters are rock solid. Have you seen any differences in the livestock? (I'm thinking of subtle unreported things like more or less algae on the glass, etc) Its a puzzle... So much for the water change idea in your case, huh!
  15. Hi everyone, Since some of you have had your aquariums' microbiomes tested more than once now, you have probably noticed differences and wondered why. While we're thinking about changes in the microbiome I wanted to remind you of this classic paper on the effects of large water changes in aquariums. The authors found that Microbial diversity increased substantially following a large water change (90%) The groups enriched after a water change include both Cenarchaeaceae (ammonia oxidizing Archaea) and Vibrionaceae (a group with lots of pathogens). (These specific effects probably depend on what community you start with before the change) The authors emphasize that microbial communities are destabilized by disturbances, leads to a succession effects like those that happen after clear cutting a forest (just much more quickly!) This is why I've always advised clients to sample before doing any of their daily maintenance. But its worth thinking about more broadly. Even if you didnt change anything in your system between sample 1 and sample 2, even normal maintenance events may affect the community for a while. The authors suggest the changes are unlikely to affect the health of the inhabitants, but I'm not so ready to assume that tripling the ammonia oxidizing microbes and tripling Vibrio are neutral effects. They just werent measured here. And the study makes me wonder about automated low volume water changes vs infrequent large ones. I didnt capture that info in the survey. I wonder, for those of you who were tested, what are your water change practices and how do those affect the stability of your microbiomes?
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