Hi urbanrat84,
I have southern erectus. They are housed with many coral, 4 peppermint shrimp, 2 porcelain crabs, a dwarf sea hare and 3 Catalina gobies. The tank temp is between 69-72F.
The lfs is feeding the pair of gobies raw fortified shrimp -- shrimp cocktail size. These two gobies are about 18-20" long? I don't know how old. They are a breeding pair.
Sorry for sounding so alarmist. These gobies just seem too big, clumsy, and ugly
(as adults) for a seahorse tank.
Good luck with these.