We have had a group in the past but it tends to be luck in how many males you get. We have had some be killed by the others and we had 2 "couples" but sadly one died and then the 3 would hang together but eventually one decided to go carpet surfing

The
purple firefish is the most aggressive of the firefish and in the Marine Fishes book it states to only keep singly or male-female pair. The dartfish that is great for grouping is the Zebra Dart Goby(Ptereleotris zebra) which is the most peaceful and is recommended to be kept in pairs or groups.They need peaceful tankmates like the purplefirefish does and fine sand to burrow in. They are jumpers just like the firefish so keep a top on your tank especially if it is a high traffic area.Not the greatest picture but they do call them dartfish for a reason
