Fry Tank

[Synirr]

....but then again, it sounds horrible to feed one small poor thing to another mean thing...hmhm..

Not a mean thing, a hungry thing!
That's what I did, I fed the weak fry to my Betta albimarginata. That way at least they serve a purpose

 

[Ethos]

I guess.
For a clear plastic 20ish gallon tub, how big of a heater do you need?
Actually, I think the tub is much larger than that...but w/e.
I'm going to have to get the tub, its a genious idea!

 

[Synirr]

5 watts per gallon is generally the recommended strength for heaters, but if your house is kept warm you can do with less. A lot of heaters say on the box what size tanks they can serve though, just to make things easier for you.