I saw the thread about a clarifier barrel and I had some questions too. I didn't want to change the subject of the other thread so I started this one.
I want to build a funnel shape in the bottom of my 55 gallon barrel. I have a shower drain installed in the middle of the bottom, but thought a funnel (or rounded bowl) in the center of the barrel would help guide the fish poop to the drain.
I've been brainstorming about what to use to seal off the funnel or bowl. I came across "Great Stuff Pond and Stone" expanding foam. Once I got it home, I read that it says it's fish safe "As evaluated for residential pond use containing fish not intended for human consumption"
Does anyone have any other ideas what to use that is fish safe for fish you intend to eat? I was thinking of using it and maybe coat it with something that is safe?
