Due to a weeks time passing since physically separating the Rainbow Bta’s from the Chicago and latter continuing to close up during the lighting period, last night around 8:00pm i decided to move the Chicago to my other tank. Low and behold, initially the Chicago was not happy, but today it is largely inflated (15 hours after move) during the lighting period, which is a great sign. @ClownWrangler, I believe my experience here furthers your conclusion that even though the nems are physically separated, some type of hostility remained in my tank where both nems were kept.Any additional thoughts on the compatibility of a Chicago Sunburst (one) with rainbow bta’s (several) in an 30 gallon? I was noticing what I think was contact fighting, and last Friday (a week ago) separated the nems. The Chicago is on its own rock a good distance from the others. The Chicago deflates for several hours just about when the light comes on. I believe I see your spaghetti reference, but not sure about the “paralyzed” reference. In the latter each night and in the morning the Chicago appears normal so far.