Looking for ideas for a small cat or something similar to clean up the bottom of the six foot 125 I just put a 6" aro in. He's eating hikari pellets and is making a bit of a mess with it so I'd like to add something non-threatening to clean up the scraps. 
I have cories, but I worry the aro may try to eat one?
Edit: forgot to mention I have a sand substrate and I'm too lazy right now to remove it, lol nor do I have space to store it.

I have cories, but I worry the aro may try to eat one?
Edit: forgot to mention I have a sand substrate and I'm too lazy right now to remove it, lol nor do I have space to store it.
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