Okay I am really new to the SW world and I am still in the planning stage for my first tank. I have been doing lots of research and I am so grateful for all the information these forums provide. I have gained a lot of confidence just from reading what all of you have written here on these pages. I started out thinking I would have to start with FO only due to my total inexperience then realized that a FOWLR tank was probably better but thought it was irresponsible to consider a REEF tank for my first tank even though that is what I am longing for. I have since decided that I will start with a Reef tank but I will do so with the knowledge that I will have to take it very slowly and be prepared to spend all my "fun money" keeping it up. I would really like to find a 75 gallon Reef ready tank and I am looking for one in my price range while I continue to research other aspects and make other decisions. If I find one, then great... if not then I will use my 55 gallon tank that I already have. Someone has suggested I use a Pro Flex Sump and I am considering it... I have no better option at the moment, I like the model 4 but would hear thoughts on this as well... My question now would be this... Assuming that I used my existing 55 gallon tank and a Pro Flex sump, for example the model 4, how would I hook the sump to the tank? I understand that the 55g, ie - the display tank would need to be set up to overflow somehow, and run by hose down to the sump... and then a pump, also connected by a hose would pump the water back up to the tank... But how do I set up an overflow for the tank... if the tank does not have a hole drilled in it? I saw some things for sale called "overflow boxes" by Eshopps. They hang on the back and look like they would work pretty good but they have a sponge pre-filter in them that I would think would be a nitrate factory. So I don't know if that is a good idea or not. Is there a better way?