Thanks everyone. Yea, our little 55 gallon is just too small. Figured it was time for a 300. This one is 8 feet long and 32 inches front to back, so the kids have plenty of room to get around. I'm going to have to get it set up before they use it as a toy box. They are wanting to get in it all the time. As soon as I get the kitchen remodeled and the wall knocked out, I'll set it up.