No, not if u keep pristine conditions and that applies to all fishes. Sparkling gouramies are great choice but make sure you keep more females than males. If not, just get more guppies, they like company as well.i was thinking that but then i remembered that they get diseases often
Corys like habrosus and those other panda like dwarf corys should be fine in you 10 gallon but those usual ones like aeneus or sterbai would need to be in 20 gallon as well as gouramis. If you really want gouramis, sparkling gouramies are perfect choice. I keep a breeding and mated pair in my tank and it is really fun to watch them.no i meant corries sorry