Thanks!
After the female took 4 dives to the floor I finally have the egg crate cut and on top of their end of the tank. The last jump was last night. Everybody was waiting for food in the tank and I hear a plop that something hits the couch. Hubby witnesses it too. I'm frantically looking around me, can't see anything, get up and look between the tank and the couch and I see the clown disappear under the couch. Hubby being the strong man he is, moves the couch further and I get my hands on the carpet-surffer.
I put her back in the tank and she is like nothing happened. That was enough trigger for hubby to go to my SUV and bring in the sheet of egg crate I brought from Lowe's.