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I am in no hurry to put an animal in my tank until I know the water is safe, but I was wondering if I could go ahead and put a plant or two in the tank to be established for when the fish do arrive.
Most plants do fine when you cycle your tank. I have had vals and crypts melt when I cycle my tanks, it could be my water or it could be from cycling I don't know. I do have crypts that seem to do well after I cycle my tank.
The plants will use up some of the ammonia, so you would need to add it more frequently to keep up the levels. OTOH - most plants have some bacteria on them, so the introduction will likely seed your aquarium & speed up the cycle. And established plants in the tank will moderate any ammonia/nitrite spikes should your cycle be incomplete when you add fish. So all in all, I say add the plants.