Peter dear, for this thread will be a lesson for all of us, can you give us a little info?
Tank size, other fish with the uaru, temp etc.
Probably more like a "what not to do" thread, lol. They are in a 55 with some cardinals and small G. brokopondo. Temp is at 87F. Tank is filtrated by 2x AC70s, 1x AC110, 1x Eheim 2217 and 1x FX5. pH will be lowered to ~pH5 within a week or two.
I'd be broke just buying filters.