That sounds good. Though I have had a harder time keeping the d. erythromicron. My d. margaritatus school never depletes, yet I've lost atleast half of my d. erythromicrons and I haven't even had them as long. Not sure what gives on that one. I'm quite fond of microdevario kubotai as well. Personally, I'm crazy about killies, so that's probably what I would choose. I normally wouldn't keep them with crays, but a couple of the smaller ones should work such as normans lampeye or clowns (Pseudepiplatys annulatus).