fourmyclowns
Aquarium Advice Activist
Yes, the surface was always like that. The wavemaker is (supposedly) overpowered a bit for our tank. I rarely open doors or windows until our weather gets better (snowing today - yuck!). In a few days I might be able to open the window nearby it again if it warms up. I do have the front of the cover "cracked" and propped open as well to allow a flow thru of air.