Welcome. If you are referring to Exotic Fish in Southampton, I think they might get their fish from Hans. Mmorris on this site is close to you and often has fry for sale. I have some of her fish and they are very nice. I think it would be worth a visit. There are also people in the area that might share shipping if you decide to order fish from a sponsor at some point, myself included. You do not need to have a drilled tank to drain and fill it for water changes, just a pump and appropriate hose. If you want a sump you would most likely want it drilled and you would need to do that prior to filling. Glass-holes.com is a good place to learn about drilling your tank. The other option is an overflow box and you could add that at any time.