Angels aren't regular jumpers, but they can hop out if startled, esp. at night. I second the cover just to reduce evaporation. Without one, the room gets steamy and the water level drops. DIY covers include everything from plastic or glass slabs to saran wrap and taped on clear plastic bags. The important thing is not to let the lid rest on the water's surface. You need it clear for oxygen to get in the water.
Covering the water's surface with a floating plant will also discourage jumping.
|