The tank has been running for 9-12 months, I have 2 other silver sharks, all three are around 3 inch long. I have tested the water and the ph is 7.5. The amonia and nitrate are spot on. Also tested for chlorine and oxygen which were in the right levels. Temp is checked daily and nearly always 25c I have 2 air stones one at the back and one near the front. My tank is a juwel rio 300 litre tank, external filter with 400-600 litre capacity and I have 56 fish, all community fish. Well planted 2 large bogwood and coconut shells etc for hiding places. No symtoms or red gills.
I did make a mistake by leaving the light on for 10 hours over night! I dont know if it could have affected it?
Other fish in the tank are
10 blue neons
4 cherry barbs
2 golden barbs
2 silver sharks ( had 3 but it died
)
2 rummy nose
2 harlequin rasbora
6 silver tip tetra
3 glowlight tetra
2 common plec
1 male betta
1 featherfin catfish
1 sailfin molly
1 dalmation molly
2 black neons
1 red tail shark
2 male guppies
3 white neons
4 female guppies
4 platys
1 leopard danio
1 pearl danio
2 chinese algae eaters ( these are going out of the tank once they get bigger because they get a taste for fish! )
Would appreciate any tips or help on the situation.
Thanx