Those are 37 quart tubs.. For adult males and most females those would be fine. If you were planning on putting babies in there then it would have been too big.

Understand you are going to get differing opinions on here as far as size.. I keep all of mine up to 1800-2000 grams in 28 quarts.. Bigger males and females will go in 42's or 41's i cant remember exactly..

So to answer your question you should be fine if they are adult males or smaller females..

How do you plan on heating them?