Fishy, some bubbles on a heater are normal as it first heats up in cold water. A stream of bubbles though probably meant there was a leak in the housing.
Bekah, tank looks beautiful!
My cats are literally what keep me from suicide every day. But for those of you with suppressed immune systems, handling cat waste is a big NO. Parasites in there. Also pregnant women should not handle cat waste. This is why my mom does not change te cat boxes. She did once, trying to be helpful and got the parasite.
Laki, feed them to your bettas.