Bottom-dweller for a breeding tank?

I have a 20g tank with 6 rasbora's and a "pair" of rams. My dilemma is that, i would like a bottom-dweller, as i've always loved them, but my rasbora's started laying yesterday and at some point im hoping my rams will lay(still young) So my question is are there any bottom-dwellers that wont eat eggs or at least not as much as others?

Thanks in advance

I've set up a small trap around the plant they spawn on. But does this mean no bottom-dwellers if i want to breed my fish?
And thanks for the advice.