A breeding tank needs to be sparce (for cleanliness) and no substrate for most species. A bi-Orb has a major flaw and that is the neck, whilst it would work, it is really fenickity when your trying to perform maintenance (just try getting a good sized net in the top of one of those. My daughter has one for her goldfish and they really are a pain.
18"x12"x12" tank volume is
11.22 Imp Gallons
13.13 US Gallons
50.50 ltrs
Regards
BigC
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Ok thanks for the info, much appreciated