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If you don't already, try Target Feding ,1-2 hours after the lights are off also turn off the pumps at that time as well, except for the return.
When it's time to feed ,then turn off the return pump, and target feed with the actinics on for a few minutes, then turn off the light's
After about ten minutes turn on the return pump.
After another 10 minutes turn on all water circulation. and maybe look at them with the actinics or a flashlight to see if they ate it.
You can try also Nutramar OVA ( Prawn roe) My acan's seem to love it and I freeze it and break it up and use it minimumally like rotifers it can pollute the tank if not eaten !
Good luck
Paul
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