Need advice on a sump, I have a 36x15” sump that leaves space in the side for what ever. wanted to know if this was a ok size for 100 gallons. I do have an option to buy a 44x18” sump for $300 but will fill up the whole stand and don’t want to buy if I don’t have to. Would this work of just do it right the 1st and go bigger and lose the space