I usually buy angelfish at nickel size because they handle transportation better and I treat them just like discus. These happen to be altum angels in a 110 gallon tank. Daily 100% water changes.
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The same with koi angelfish, albeit in a smaller tank.
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You certainly don't need this level of water changes to grow angelfish. I'm doing this to maximize their growth rate and form. The finnage on angelfish is actually very susceptible to nitrate levels. When you see stubby angels, it's usually due to nitrate burns when they were crowded. The fins never grow back the same way afterwards.