Hello! I’m staring a 40gallon tank for 2 fancy goldfish. Im going to put a sponge filter and a heater and a couple rocks from my already established tank to “instant cycle” it. But the BB needs an ammonia source and I need a light bio load. Will the BB handle one goldfish? Or can I just put some snails in and that will be enough? I don’t want to put too much or too little bio load so that’s why I’m asking. Thanks!