what is the substrate exactly?
i would check the pH with a low pH test kit just in case.
will do so asap
nitrites should be ZERO...any level of them will likely set off these gars to some extent; if you don't have a test kit that goes down to zero, get a different test kit.
will do so asap
the dark color could be due to tankmate stress, but that is unlikely given the size of these fish and likely age...the issue is still likely a part of the physical environment.
given your water is neutral and you're doing a lot of water changes, i would cut the water changes to 50% once a week and see how things go...water changes do cause fluctuations in pH, and this may be stressing the gars a bit as well.
there was a point where i was doing 75% twice a week. just fyi. will do so w the cutting
how much are you feeding, how often, and what are you feeding?--
i'm keeping feeding to less than the fishes would like. they're begging for food almost all the time
Monday: no feeding
tuesday: light feeding, bits of shrimp or some feeders/pellets to keep them from going beserk
wednesday: no feeding
thursday: light feeding, bits of shrimp or some feeders/pellets, they're usually beserk by wednesday night
friday: no feeding
saturday: i feed them till they're full(either feeders or market shrimp, they get better coloured after feedings)
sunday: waterchange
--solomon