If possible, you could give no-lights a try but it sounds like this is unlikely to be the major cause.
Trout pellets are made by many. You can find them on-line but it may make a difference which brand they are used to.
Finally, the new fish may be getting accustomed / working out immunity to the new (to them) bacterial, viral, and/or parasitic cultures that exist in your tank. This is common and definitely happens to both new introductions and also the old inhabitants of a fish tank and it can sometimes be a lengthy process.
That's also one reason why we quarantine.
Needless to say these processes are most usually latent and we can only guess what might be happening. I think it's not unlike in people - fishes getting a booster of a pathogen and going through a mini-illness to work out an immunity.
Trout pellets are made by many. You can find them on-line but it may make a difference which brand they are used to.
Finally, the new fish may be getting accustomed / working out immunity to the new (to them) bacterial, viral, and/or parasitic cultures that exist in your tank. This is common and definitely happens to both new introductions and also the old inhabitants of a fish tank and it can sometimes be a lengthy process.
That's also one reason why we quarantine.
Needless to say these processes are most usually latent and we can only guess what might be happening. I think it's not unlike in people - fishes getting a booster of a pathogen and going through a mini-illness to work out an immunity.
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