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A group I was thinking like 6-8 of one species with some other type of fish to mix with them. Also if I could get a 40 breeder would a 30 gallon work dimensions are 36x12xx16.
A 30 could work for labs but i wouldnt stock any more than 6 for that size tank and you would need superb filtration along with an aggressive pwc schedule.
Cobalt blues are much to aggressive of a cichlid to put in a tight quarters tank like a 30gal. IMO