Ok i have a hood on my tank but i want to replace it with new one so i can cut the back to fit what i have set up. There is a big hole in back for my loaches to jump out of if they find it. I have heard of fish jumping out and i don't want this to happen. So for right now i have a towel covering hole. My tank is 29 gallon but i measure it and the top is only 29.5 inches from lip to lip for hood to sit on. I cannot find a hood for 29 gallon tanks but i can for 30 gallon tanks. Should i buy a 30 Gallon hood and see if it works?