G. loreto is a very social fish. If you are ever fortunate to see a harem of these fish in the wild, the social interaction is amazing. The problem for most aquarists is that they simply do not have the correct setup for a group of these fish. I have a harem of six individuals in one of my systems and they have been doing extremely well for almost two years. In my experience you need the following to be successful with a group of these fish:
- Large tank. Mine are in a 120 gallon system. Please dont try to keep several grammas in a 30 gallon tank, they will kill each other.
-Rockwork. Grammas loves caves, overhangs and crevices.
-Simultaneous addition. Be sure to add them all at once, otherwise territories will be established and newly added fish will be bullied.
-Feeding. FEED your fish. Grammas are planktivores are feed from the water column almost constantly throughout the day.
Obviously there are exceptions to this and I am sure someone has fifty grammas in a 10 gallon tank, but in general the above is accurate.
~Michael