My tank is a 125 with 600 watts of power compact 3x96 actinic and 3x96 10000k. The brain is up a little on the rocks as well as the pagoda because my sleeper goby likes to drop sand on things. I feed both of the with DT's marine phytoplankton with a syringe directly into them. The brain does not ever open with tentacles in order to feed it a silver side or a piece since it is small. I work at the lfs and was feeding the open brain in our 29 biocube display and it was open huge with tentacles and all. I just dont know why mine doesnt open like that. Its very sad
everything else opens fine. Very frustrating when water parameters are fine as well as vitamins and minerals in the water. I do water changes weekly.