You have a couple of differant choices at the moment, a few of which
have been posted here.

buy youreself a wooden hood which can house a light and lighting unit,
that should pretty much stop your cats getting to your fish.

Also another choice is if you dont want to go with the hood option is
buy a pane of glass and put it over the top of your aquairum and once
again thatll stop your cat getting in there.

The third choice is always get rid of the cats lol



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