I have a tank like that. What I did was to place a sheet of tempered glass on top of the screen top, There is some space to allow air in and out.
A glass top is not necessary, but it helps keep the humidity level stable.

Then I got some nylon luggage straps/ tie downs. I fitted those around the tank, but if you do this, be careful to avoid place them across the UTH and away from any lighting that could catch fire.

I think when dealing with balls, using several locks is a good idea.


I found tank clips that work with my tank, fit properly and don't fly across the room when I set them. I use six of them on my tank. Yes they are sold two in a package, but I want that lid to stay on.

They also sell terrarium tie downs in two sizes on Amazon:
search:
OASIS #48231 Tera Tie-Down Securing Strap for Standard Wire Mesh Covers

They are also nylon, so be careful not to cross them on top of any heat or light source.

You could probably use metal cables too.

Other people will have some better ideas.

You could probably fashion some tie downs out of leather belts. Can buy these at any thrift shop for cheap. Use caution if punching new holes in the leather. Its easy for the awl to slip; had a friend almost take out his eye because he was holding the awl and the belt at an unsafe angle.