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I have 18 shrimp in a 90l tank. They have never shown much interest in any food I give them. I give them a pinch of spirulina every 3 days and three or four pellets of JBL Novo Prawn. I've tried blanched vegetables, hibiscus flowers etc and the ignore them all. Dies this mean they have enough biofilm? I have thousands of detritus worms, including some which are swimming about in the water column, which would suggest I am overfeeding, though this seems hard to imagine with the tiny amount I am putting in. A couple of RCS females are berried so I am reluctant to give up the spirulina as I don't want the shrimplets to lack food when they arrive.