Hello. I have a freshwater tank and have 2 cichlids, one convict, the other is orange. I also have two redfin sharks in the tank with them.. it is a 25 or so gallon tank, established, and I have had them all for a while. My problem is that I can't seem to get the tank right. My ph and everything is always off, too low, my water sucks, and I've tried everything to get it right. Water changes, aquarium salt, stress stuff, etc...my nitrites and nitrates are high, ph too low. They don't seem stressed out all the time, but I know they have to be. Nothing gets it where it should be. The fish seem fine, but the convict cihlid changes colors alot, loses his color and then it will come back. The orange cichlid is aggressive and chases him all over. The sharks don't bother with them, and visa versa. I don't want to keep adding chemicals all the time and kill them or something. I keep adding ph up and it's not working at all it seems. Should I let it be, or what?? I never knew a tank was such a process!! What is the simplest way, and what exactly should I be using on a regular basis to get this tank to where it should be??