Planted Tank Obsessed
Join Date: Apr 2010
Location: Spokane Valley, WA
depends on how big the koi are. and how big the cardinals are. Colorwise my kois go well with black and white fish, such as black neons, emperor tetras or the like. It brings the eye to concentrate on the school as a whole, and then brings you right back to the beautiful coloration of the kois. With a cleanup crew, I would go same route, oto's and amanos (depending again on the size of your angels) as to keep the uniform drab effect strong.
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