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If you are still seeing some ammonia it sounds like you aren't quite finished with your cycle. If it were me, I would wait until the cycle completes and the tank stabilizes before you swap substrates.
yeah, I am considering making the switch, but I agree in terms of waiting for the tank to cycle prior to changing the substrate. Sand will look beautiful though
If it's freshwater it can because I'm almost positive that all freshwater crabs require land to climb on however you may want to check
I like your school of neons/cardinals, very colorful!