It’s hard to tell in pictures but the water surface is agitated at a good rate. No, not a solid acrylic top. It will be highly perforated. It’s mainly to be used when I’m not home.Just remember it is important to have good gas exchange. Since you are using a canister filter, the only way to do that is the water surface. Adding an acrylic top, (hopefully a screened top and not solid). You need to find out some way to disturb the surface water of your tank.
