Yeah if he’s doing damage like that at 6 inches I’m afraid to see what a 10 inch guy would do...?
Another thing I considered but Im real paranoid of sand getting stuck in it and scratching the glass lol.
Maybe my only option through.
I normally use the edge of an old bank card/store card it has worked great for years untill I got my FH ?.
He's the only fish I've ever had that doesn't seem scared by anything, that's the first time he's bit me but he's always trying.
He's only 6 inch now I don't want a bite from him when he's fully grown ?.