The cat here seems desperate to access aquarium water. Will leap into aquariums, break aquarium lids, jump into a bathtub, turn door knobs, push furniture and move/break other objects in order to access aquarium water. Any buckets left out from cleaning filters, cricket tanks, regular water changes are also eagerly drank from by this cat.

I don't know if this is normal, but it seems cats prefer dirty water over clean water given the effort this cat puts into getting dirty water, when clean water is within easy reach in his bowl.
If it works, maybe put out some dirty water out for the cat and then the cat will leave your clean water alone.