Hi Northern, Im new to the forums as well to candle making but one thing I do know for sure is fish, having grown up in my dads fish store. I absolutely would not put candles in fish bowls with live fish. The FOs and dyes would contaminate the water and kill the fish. What you could do is maybe get some sort of hurricane or glass tube to go into the center of the bowl secured with aquarium safe silicon adhesive and put a LED candle in the center (if the candle glow is all you're going for) and then pour the water and fish in the bowl so it surrounds the glass tube. (hope that makes sense) Another idea would be to put a smaller bowl with the fish into a larger bowl upside down so it looks like the fish is in a bubble (make sure there is some air at the top of the "bubble") and then float your candles in the bowl. However, I think the first idea with the LED is probably safer for the fish.