I started out doing what the instruction said about rinsing the sponge and filter bags with tap water. Then read about it being better to use either tank water or some treated tap water in a bowl. The chemicals in the tap water can sometimes kill good bacteria so it's safer to use treated water - for the good bacteria. Either way, the fish would be safe. It's just a little thing but i want to try to do anything i can for good water chemistry.
It's actually good bacteria that builds up on the surface areas of the bio-wheel. The bacteria needs to be in water, that's why it's so important the wheel keeps turning and stays wet.
Sounds like you've got a handle on it.
