Hi all, I'm a new member here and have never had a salt water tank before. I've been reading on the hobby for over a year now, just lurking. I purchased a 48 inch 4 bulb coralife t5ho frI'm a buddy who upgraded to an led fixture and he also threw in a 55g and stand. I am NOT wanting to use the 55 though. So a little info about my situation so you have a little insight to my concerns. I'm going to be moving into the up stairs of my aunts house for around a year minimum, maybe more while saving for the down payment of a house. Her house was built in the late 1800s and is brick exterior walls. I live in minnesota so placing the tank ok am exterior wall doesn't seem like a good idea in a house of this vintage. Now into the tanks. I've been looking at either purchasing a 29 biocube and starting out with that, or getting 2 40 breeders and using one for a sump/fuge. I have no doubt that the house could hold 70 gallons of water, especially if I place the tanks perpendicular to the floor joists. I absolutely love the looks that both of these tanks can have but I'm leaning more towards the 40s. However my dilemma is my buddy whom I purchased my 48 inch light from is getting discouraged with his tank as it crashed on him again and he lost 4 fish this time. He is now wanting to sell it and said he would sell it to me for less than I'd have into the cube after I got it set up. He has a 75 sumpless, a name brand led fixture ( can't remember which, but know it was about 500 on black friday), he also just bought a skimmer not to long ago. For me I love the idea of a sump just to keep the idea of the display tank clear of "clutter" but I'm not sure if the house would hold a 75 plus a sump/fuge. If you were in my situation which would you go with? The nice thing about his tank is its already cycled and he's pretty good at moving it lol. Sorry for the long post, but I hope it helps you understand my predicament a little more. Thanks in advance