Thanks. I like to listen and help when I can. The thing is, August is still months away. A large and aggressive cichlid can decimate a tank in hours, days, or in a few weeks. You just never know what's going to happen. If you separate them between the tote and the 75gal. It may make things work a little better until August. Another problem is that your fish in the 30 tote will continue to grow during this time. That may cause more problems in a cramped space. Since this is temporary you'll probably have to monitor the fish and switch them around until you find the right mixes that work between the 75 and the 30. The only thing to do is to try it and keep an eye on them.