So Ive had a large foam filter over the intake tube of my tanks to keep my betta's away from them. Usually if I dont, I'll find a nice torn up tail, as Koi's is right now.
So while at Petsmart I was looking around (trying to avoid the betta's) I found some smal foam filers for about $2.50 each... Picked up 2 to try.
PERFECT fit. Put them on both of my betta tanks
Floval EDGE A1387