I'd do something like this to clamp the tubes. Glue a screw to the top of the manifold then put this widget on and use a nut to tighten down so the nibs hold the tubes in place.
I have not added berghia, so not those. It kind of looks like the lettuce nudibranch, but was pretty flat and did not have any visible antennae. I'll keep an eye out and try to get a better picture.
I tried to use one of the inexpensive auto pipettes from Amazon to get the same 0.1 ml every time, but the $40 version was less accurate than using the syringe in the kit.
Think it depends on the generator. If the generator has a dedicated ground other than the frame then it would be required. I have a Predator 3500 and Honda eu2200i and they are grounded through the frame.
If you plan to connect a generator via transfer a transfer or lockout switch to your house it has to have the correct plug on it. 4 prong plug: 2 AC, 1 neutral, and one ground.