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I'm not sure what the size of a tank has to do with the amount of room underneath it... However, if it was an option, I'd definitely go with the 25 over the 15. The 15 high is kind of an annoying size to work with. (In my opinion).
H. comes fry are pelagic/demersal (do not hitch at birth) and are similar to H. reidi in care. You'll probably need rotifers/copepods for the first 3-7 days.
I think RDSB's are great. I especially like that having a shallow sandbed in the display makes moving tanks around much easier. However, they do take a while to have a noticeable effect. I've never added one to an existing tank, so I don't know how long it would take for one to have an effect there, but when started with the initial cycle, it has been my experience that it takes at least 6-8 weeks before there's any noticeable effect and 3-4 months before I'd say that an RDSB is really effective. I've never tried to seed one from an existing RDSB, however I plan to try doing so soon.
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