So i was thinking, I need a filter of sorts to go on the fill up hose I run from my shower to my 220. After every top off or water change, I have to add a LOT of prime, sometimes double dose or more (bottle said it was safe) in order to get my cichlids to stop top-breathing. I get so worried every time I do it but i don't know what else to do, it didn't happen before i moved in June. It was always straight tap water and prime and i was good to go. What is in my water now? I am pretty handy and can build something If i have to, I was thinking maybe those RO type filters for drinking water that connects under your sink? Is that what i need? Help me out, I feel bad and am plowing through Prime.