3D Background Problems

I have a pangea 3d background in my tank. Unfortunately, I cut it too much width wise, and the fish can swim in the back.:headshake2: Basically, there is a two inch opening on each end of the background.

This presents a problem. The smallest discus in my planted tank hid(was getting bullied) in the back so much that he never got fed. He just died. I can't fit the net behind the tank and I am worried about it affecting the other fish.

I'm also worried that if it's not decomposed by the time I move(one month) that it will cause some problems. Should I just let nature run it's course? It seems that I have no choice since I can't get back there. Keep in mind this is a 6 inch fish.

Lastly, I feel like there is no way to prevent these fish from going in the back. It makes me want to get rid of the tank(72g bow). I have thought about dividers, but the wholes on the side are slighty big and uneven. Any thoughts.

It is a beautiful background, but it is causing me some headaches.

4 month old pic.

Come on! lol

I'm moving soon, any opinions?

Well, I've tried everything to get it out. It's not happening. I will do two water changes this week. I'm sure the fish will be fine. The tank is overfiltrated heavily(eheim canister and coral life UV).

As for the holes, I think am going to try a large rock pile. Wish me luck. It seems that no matter how small the hole, a fish will try to fit in it. lol

It isn't much of an option to remove the background. It is siliconed to the bottom of the tank. I mean, I could break everything down and take it out permanently, but I paid $200+ for it. So I'm going to try and block off the openings first.

I managed to get the fish out though today, after playing around with it for a 20 minutes. I am going to get landscaping boulders, and try and block the wholes like that. My only concern is arranging them in a way that there is NO chance that they will fall over.

This shall be interesting. lol Thanks everyone for the suggestions.