Better still, have 15 blacks and 15 whites. And then you have England playing The All Blacks
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So no centerpiece fish?I would not add any gourami to a tank with white skirts. As already mentioned they are nippy fish and I wouldn't trust them with gouramis.
I would not get dwarf gouramis even when there are no nippy fish. They are often infected with an incurable disease by the time they arrive at the store. Another problem with dwarfs is that many stores sell only males, and these are quite aggressive fish so only one male per tank. Females are plain silver-grey and stores don't sell them because "they are plain and boring and no-one will buy them"
Honey gouramis were mentioned as a possibility, but there's still the white skirt issue. Honeys don't have the same issues as dwarfs.
How about a ram then?It's fish with long fins which are the problem with fin nippers and gouramis have those long dangly 'feelers' which would be irresistible to nippy fish.
Cories could be OK as they tend to stay near the bottom of a tank.
Could I get arrested for animal abuse if I put a pair of dwarf gouramis in? And some extra white skirts?Rams ned warmer temperatures than cories; they are not really compatible.
Tanks don't need a centrepiece fish, especially smaller ones like 30 gallons. Since you already have the white skirts, more of them would make a lovely display particularly if you were to mix white and black skirts as itiwhetu suggested since they are the same species.
Very picky with water conditions....they aren't easy to keepGerman Blue Rams?
Very picky with water conditions....they aren't easy to keep
If you have skirts tetras of ANY kind, most fish aren't going to work well with them