30x18... my apologies, that does make a bit of a difference normally. Standard 29 is 30x12 so I definitely stand corrected! Not that I am any sort of discus expert, but the length of that tank (IMO
) really only lends itself to a pair purchased as a pair - discus are cichlids, after all, and even a group of young fish will have a tendency to be nasty toward one another when kept in a small space. Again, jmo.