if the rectics have full tails they will outgrow that tank but if they dont have full tails they should be fine in there...since when full grow(with tails) they need something atleast 30" wide
all but one of mine have full tails but yes most dont(IMO they look way better with the full tails) and scobina have shorter tails rectics have super long tails for some reason(tho not as long as antenna rays)