The Puffer Forum

Hi, new to Forum and need some advice,had 3 figure8 for past 3 weeks and the smallest one got caught in the oil catcher on filter since then his belly is almost always grey until the lights go off the other two are totally fine all eating and moving around constantly just that I've read about about the fish being stressed is this the case?
Tank is 197 UK liters 0 ammonia 0.25
nitrites 10 nitrates 1004 salinity.

It sounds like your tank is not cycled. I'm moving this to the Hospital forum. Please answer all the questions above, in red.

1.
0 ammonia 0.25 nitrites 20 nitrates ph8 salinity 1004
2
197liters 43 UK gallons 3 figure8 all about 2"
3
Feeding once a day
20% water changes every 2 days using reeflowers water conditioner and stress guard and adding waterlife bacteria at the stated dose
4
No changes in tank at all apart from water changes
5
The tank has been cycled for about 3 months using media from my dwarf puffer tank it also housed my fahaka for a month till he got his new tank,
It all started about 2weeks ago that he got caught in the oil catcher near the surface he went grey on his belly then we noticed when the light goes off it turns white again,soon as the light goes back on he goes grey again also when feeding time he goes really dark grey, he was pretty amiciated when I bought him so I did treat the water for worms.
He seems OK in himself swimming normal eats like a pig no agreesion from any of them, the nitrites showing are from abit of an ammonia spike caused by over feeding and turning the water to brackish but he was like this before