I am having trouble with my fish dying.the wat er seems to be alright,amonia0 nitrite0 nitrate25 Ph7.5.The fish i have are 4 Bolivian Rams,4Cory`s 1 pair dwarf guoramies, 2 small bristlenose cats did have 10 neons(now 2 left) 6 rummy nose(now 1left) 3 hatchet fish,now 1 dead.My tank is a Aqua...