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how does this size tank sound?

We used to reccomend 30 gal as a minimum for bimacs, but some people found that these tanks were pretty cramped for a full grown one.

Not to mention there are some bimacs which grow larger that te stated size. So we decided that 55gal should be the new minimum. That way, your bimac will have more space to explore and jet around wiithout hitting the decor.