hi everyone. i need to get at least one but want to get a group of 5 greenbanded gobies (Elacatinus multifactiatus) formerly known as (Gobiosoma multifaciatum). any know if they do well in groups?? can not find that much info on them so any advice/info will be greatly appreciated. my tank is 72X18X20. i think they will do fine in a group of 5 in this tank but just dont know for sure.