Expanding Foam Unfortunately, those foams only come in an ugly yellowish color and could potentially be unsafe for your fish. It is black in color and non-toxic for your fish.Click to see full answer. Also question is, is Great Stuff foam toxic to fish?No toxicity issues once it’s cured. I’ve use a similar black pond foam without issue. However, the same company makes one for ponds, GREAT STUFF™ POND & STONE. They advertise this product to be fish and plant safe.Also Know, is expanding foam toxic? Once the foam has fully expanded and dried, manufacturers say it is inert. If the chemicals are not properly mixed, they may not react fully and can remain toxic. In addition to the dangers associated with installation, these chemicals can potentially remain unreacted in the form of dust or shavings. People also ask, where should you not use expanding foam? Spray Foam Around Windows and Doors is A-Ok But it can actually push the jamb inward, making them impossible to open. Avoid this by using minimal expanding foam. It’s formulated to fill the space around windows and doors without excess expansion. Look for cans labeled for use on windows and doors.Is polyurethane foam toxic to fish?Once the alcohol evaporates it’s completely safe. It’s just not water resistant at all. If you are buying off the shelf commercial foam, you have to make sure it doesn’t have additives to make it mildew resistent. If it does it will kill your fish and shrimp.
