One of my two Corys has started to act quite docile this evening and he looks like he's getting pale. He seems to be spending more time than usual at the bottom of the tank. He usually spends loads of time with his mate side by side.
I did read somewhere that this can be natural but I am looking for some advice. I feed the Corys the biscuit things but the other fish seem to be very greedy. I feed them tetra colour pellets which float and then hide the buiscuits to try and give the Corys a chance to find them but to this day I'm not sure how much food the Corys are getting... The tetras, angels and mollies are speedy eaters.
I feed them every other day.
My fish are in a 153 litre tank with the following friends:-
1 x Koi Angel
1 x Marbel Angel (small)
4 x Tetras (small to medium)
2 x Balloon Molly's (small)
I tested the water earlier for pH, Ammonia, Nitrate and Nitrite.
pH was 7.6
Ammonia was trace but less than 0.25 ppm
Nitrate trace but less than 5
I performed a 20% water change on the weekend and the tank has a couple of bits of driftwood and, some plants and some rocks.
Lastly I have an Eheim canister filter pumping 1000 LPH.
The tank has been set up since October last and along the way I have sadly lost 2 of my tetras. To this day I have no idea why but my water levels have always been trace.
Can anyone give me some advice on why my cory is being docile?
Thank you all