kdrun76;3648722; said:Pacus need about 300 gallons of water EACH.
Is your test kit the kind with dip sticks or liquid reagents?
It isn't possible for your nitrates to be zero. Either your test kit is useless, you can't use it, or you are lying.
FYI-
Mine is outgrowing my 500 gallon.......I suggest a 600 gallon tank for bare minimum to even think about one Pacu......