I would never have a tank without a close fitting, nothing to do with the fish, but I do have a problem with a water loving labrador, cant keep the maniac dog out of water, any water.
You would think an aquaium was too small for him, but nope, left with a 10 litre bucket of water and he puts his front paws in and his whole head under the water!!!
I have to make sure the bathoom door is locked when taking a bath - he makes a **** of a splash when he jumps in on top of you!!!!