I've had a male albino for a couple of months now, i hve him in a 30l tank with an undergravel filter and gravel, up untill a few days ago thats all there was. He was ok to start off, feeding ok but he soon started to decline, his appetite greatly reduced and had a opaque film over most of his body which at first i thought may have been his old skin coming off but then was told no it was fungal, after he started to refuse food completly i decided to do a water test which revealed a low ph and small amounts of ammonia and nitrites were present in the water so decided to do a water change at which time he was very lifeless, i could pick him up and he wound just sit there limp, anyway i continued with the water change to see if it may help. After the water change he started to look better and started moving again, approx a week later i tested the water again, ammonia and nitrite gone but ph still low. his appetite is still not good, has eaten i tiny ammount of food but nothing substancial, i have bumped the ph up to 7-7.5 and added plants for shelter, anything else i could do to help him?