My two cents: I would start a water change routine weekly - I do 25-30% with RO water so I can get away with a little less on the %, but clean water is always better. 6.0 on the PH is just fine IMHO. The fish you have are mostly from water where the ph is on the acidic side of neutral anyways. Large plecos poop alot so the more water changes, the better. Try and find out what your nitrates are at. I try to keep mine below 5ppm - the fish seem much happier for it. Look into getting a bigger tank for that pleco - he has already outgrown it. 55 gallon or larger would be the minimum if you ask me. Its much easier to keep the fish happy in a larger tank because everything is more diluted in the water. I try to add only dechlorinator and trace minerals (because I use RO water) and thats it. No aquarium salt and no chemicals. Since I started doing this I've lost one fish to an unknown infection that probably came from before my tank. Take everything I say with a grain of salt - I'm no expert - I've been at this hobby for about 6 months but I've made a lot of mistakes! Somebody on this board will correct me if I'm wrong about anything. I think if you increase your maintenance schedule and stop trying to monkey with the water chemistry, you may have better luck.
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