Why not convert the 10gallon into a sump. All u need it to get 1/4” acrylic from Homedepot and cut it to fit and make the baffles.. it’s really not hard to do
Do a search for sump kits. There's a 10g kit available on amazon. If you are uncomfortable doing the silicone yourself, someone on the forum would probably come over to help you. Good luck!
I think your best bet might be to go to home depot like previously mention and buy the plexiglass... take it as a DIY project, there’s a bunch of vids on YouTube .