I agree that a sponge partition will be a better solution than a small sponge.
A small sponge on the airlift tube clogs up easily and soon impedes the water flow after a few days. But if the sponge is cleaned every other day, it may be workable.
Using a top filter can also be another good idea, with the water inlet in one tank, and the water outlet in the other.![]()









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