You really cannot use a gravel vacuum in a 2 gallon. That is yet another reason why this setup will not work... especially for neons.
The gravel vacuum is used to clean debris on the bottom of the tank. It acts as a siphon. This is how you clean fish wastes. By as said, it is very hard to use in a 2 gallon. Perhaps they have a small vac, but I haven't seen many.
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