well, this is still available and i now have a Cole-Palmer Masterflex 7523-70 peristaltic pump with 7518-10 easy load head and tubing plus quick disconnects.
Also have a small C02 tank partially full.
while i was accumulating all of this I started dosing Tropic Marin all for reef and i'm really liking the results so i'm going to stick with that. it might cost more than a reactor but it's easy to use.
how about $600 for everything in this post? reactor, media, pump, tank