I have been raising cards for a few years now in my main display tank and in my larger frag tank with decent results. Since starting this venture I have grown out some 30 fish to maturity in hopes of scaling up production. What I have done is set up 4 - 70 gallon tanks that have all been drilled and divided. one tank into 4 sections, another into 3, one into 2 (23 gal & 47 gal) and the last as a sump. The cards are still new to this system and are calming down. What I have noticed is that they are spending alot of time looking thru into the next chambers at the other fish. Should I put a blind up between the sections to they cant see one another ?