I personally wouldn't mention it until you see the lease (but before you sign it, of course) to see what it says. Every lease is different. One apartment I lived in stated any animal was allowed, but anything that lived in something larger than a 10 gallon tank was considered a pet requiring a $300 per-pet fee. The place I live now, I never even had to mention my animals. The lease states that reptiles (as well as any other pet) are not allowed in places that do not allow dogs or cats, but in pet-permitted apartments like the one I live in, only dogs and cats are to be put on the lease.
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