I have 4 ottos, 3 nerites, loads of CRS shrimp and 4 baby BN catfish. Will get some SAE as soon as I have a big enough tank. The nerites seem fine with my DIY C02, haven't lost any but they tend to spend most of time in the filter of my river reef tank, don't know if that is co2 related. One BN likes to rasp the leaves of my amazon sword. He would get evicted if he didn't belong to my son. The others are content to leave the plants alone.