I've been planning this build since I got my new home about 6 months ago. I still have a lot of 'issues' to work out, and I am hoping that starting a thread here will be a way to get a lot of them answered before I start spending money. I have 3 primary goals with this build: 1) To reduce the risk of overflows and potential breakage (I have a glass tank now). I literally have nightmares and leap up in bed from time to time thinking the tank shattered. 2) To reduce the maintenance load and improve the tanks ability to function with limited intervention (like going on vacation for a week). 3) To enjoy my tank more. I have found myself becoming frustrated and unhappy with my 'hobby' and I have come to the conclusion that it is because the tank resides in a room we almost never use so most of my time spent with the tank these days is during maintenance. So this project will put the tank in an area of the house we use regularly. The reason I am doing two tanks is because of the placement of the tank. What I will be doing is using the two tanks to build a 'wall' in order to turn a loft into a den. We were going to build this wall anyway, so this seemed like the perfect opportunity. I have some preliminary sketches of how this will look that i will scan and post later. The idea is to have a french door in the center with the tanks on both sides. The tanks will be open on 3 sides (kind of like two peninsula's with a door between them). This wall resides on a primary load bearing floor of the upper story. I verified this with the builder (foreman), but I am considering asking an engineer of some sort (structural, architect?) to come out and give me an 'ok'. This wall also resides directly kitty -orner to the 3rd car portion of my tandem garage. I drew up a rough sketch of the layout and planned plumbing: The biggest issue here will be the plumbing needed for the second tank to go under the door. These are 10" joists though and I have various pictures of the sub flooring from before the house was completed so I don't think it will be an issue to bring a couple of PVC pipes through a few, but this is another thing I am looking into. The tanks will be 100g Acrylic (48X24x20) tanks. I already have a lead on a pair that I hope will do the trick and I should know in a few weeks. As I require the overflow to be on one end of the tank (which will reside behind cabinetry) these tanks do not have overflows. I will be modifying them for my purposes. I cannot afford to buy custom made tanks, so this is the next best thing. I could probably go as large as 120g to be flexible. My current tank is a 75G reef and has been up and running for about 3 years. I built the sump out of a 20g and custom built the refugium out of high grade acrylic. I won't be reusing it sadly as I made one major critical design flaw that has caused me a lot of grief. The first tank (the on on the left) will be the replacement for this tank. I have not yet decided on exactly what will reside in the right tank, though I am leaning towards a FOWLR or aggressive tank. Equipment I will be re-using: 48" T5 HO 8 bulb fixture Large (220g) Coralife protein skimmer 1 #4 Koralia ~85 live rock Various heaters, pumps, and plumbing parts. 1x Reefkeeper Typhoon 3 extreme 1x 10g quarantine tank Clip on refugium light auto-top-off system Equipment I will need to buy: (I have a tight budget for this project) Light fixture for second tank (smaller) More Koralia's based on need ~100lbs of rock, not live, which I will cure and seed Sand, which I will buy not live and seed 2x high head pumps (probably Iwaki's) 1x ~60g used (as long as it holds water) acrylic tank for sump 1x ~50g used tank (or other container) which will be used for 'simple' water changes 1x refugium, undetermined size/design Various plumbing supplies Plywood, Particle Board, 2x4's and hardwood for cabinetry I will initially be focusing on getting the first tank up and running before I tackle the second. I will build it out, but won't fill it or populate it until after the first tank is complete. This will allow me to break up some costs (light, 2nd pump, etc) and keep me from getting overwhelmed. Also a major part of this plan will be a cabinet in the garage. I plan for this to be a 4' wide floor to ceiling cabinet which will house all of the equipment. I have some sketches of this I will also post once I scan them. This will basically house a sump on the bottom with a 'mixing tank' directly above it. Both will have drains. When a water chance is required, I will simply put salt into the mixing tank, let it sit. Then open the drain on the sump until it empties to a certain point, shut the drain, open the drain on the mixing tank, and refill the sump. This should resolve the hauling water across the house issue and make maintenance much simpler. The cabinet will also house my filtration system, quarantine tank, and refugium. Problems I have yet to completely solve: 1) Plumbing under the door. Is this going to be more of an issue than I expect? 2) What size drainage and return for each tank? and should I house this in a larger surrounding pipe as it passes through the wall into the garage (to catch any potential leaks). 3) Difficult of adding an overflow into an acrylic tank while taking lip into account. Also what design to use (Corner, or just section off a few inches completely). 4) Upper cabinet design that will allow for easy maintenance. I have a few idea's on this, but I haven't come to any conclusions. 5) Will the weight of the tanks be an issue. I don't think so as long as I stick with 100g. Each tank at aprox. 1000lbs spread over 6.6sq ft is only 151lbs per sq ft, but I want to be certain. 6) The million other issues I haven't thought of yet. I have every woodworking tool known to man (and have been building things for 15 years) so all the wood working portions shouldn't be an issue. I've also previously done some Acrylic work with my hand built refugium and sump. I don't believe anything in the scope I've laid out is outside my skill-set. Part of the point of this thread is simply for me to keep organized, and keep motivated. I certainly do not consider myself an aquarium expert, and I am hoping for any advice anyone is willing to give. Nothing trumps experience. I hope to get started in the next few weeks, I'll post some pictures of the locations and sketches I've worked up this weekend.