[alprazo]

I have used multiple different tubes, including pex from a plumbing supply for a horn shark. Their back jaws are so strong, you need almost a rigid pipe or to sedate them which is costly. Anyway, for small fish, I have found that angiocaths and cordis used for IVs and central lines work the best. Of course, pull the needle or lead wire before inserting.

Btw I was able to easily tube feed a moorish idol. It can be done for most fish. Some are easier than others. I imagine something like a trigger would have to be sedated, but most fish and small sharks and rays do not.