Water quality is fine, fish still dies?

hafsac

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Ive had my 70l tank set up for over a year, and generally it seems fine.
I then get spells of two of three fish (tetras, guppies etc) dying from what seems to be dropsy- they suddenly swell up, go pine-coned and get popeye then die.
I change my water (about 12L) every other week with a good gravel clean (i have a plec too)and monitor the water and apart from a slightly high nitrate which is typical of the water in general where i live its fine- ph 7.2, no ammonia or nitrate.
I use an air stone constantly to keep the tank well oxygenated, i have plenty of rocks and plants, both natural and real for the fish to hide in and maintain a temp of 26C.

Im not sure where i am going wrong! Ive recently bought internal bacteria specific treatment on the advice of staff where i got my tank from, but they couldnt think of any reason as to why this might be happening.
Also, ive notice a few of my guppies seem to get blisters in their tails that come and go and i wonder if this might be linked?
 
I have a salt water 12g nano cube delux by JBJ. I had it run for a month. Tested the water at 2 places, everything was fine. I got a shrimp, then it died. Got another water sample, everything was fine. They suggested I get a cheap single fish to test it out. So I did, the blue damsel lived for about three days. Does anyone know?
 
if your fish had little white dots on the tail or body, it had ick. ♥
 
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