my sis has an infloor 200 gallon pond filled with feeders and comets. its been running for 4 years w/ no top and so far 1 fish has jumped out because her cat fell in the tank.
WeeNe858, I think that might happen if the water level is close to the glass. In my case, there will be a good six inches between the cover and the water. Even though, I think cleaning is a small price to pay. Did you mean that the plexiglass would turn permanently cloudy over time?