Is there a small (less than 4 inches), peaceful, catfish (other than a corydoras or otocinclus b/c I have experience with those) that is a solitary bottom dweller? I think this is the only type of fish I haven't really explored much at all. I'm just curious b/c I have not found many that catch my eye. I don't really have room for one unless I get another tank (which may happen if my daughter gets what she wants).