I haven't tested it, but it makes sense to me that in a heavily planted tank doing PWC to remove the ammonia may not affect the cycle to the same degree that it would in a nonplanted tank. Especially when you have such a heavy source of ammonia as AS? Most other substrates don't have such a heavy organic content...
I can say from experience that doing PWC on fish-only tanks can dramatically increase cycling time, however. The issue is that you remove the food source for the N-bacteria, and in a fish-only tank there is little else to rely on to feed and keep the bacteria reproducing.
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