ok so i am new to marine and havenot built my set up yet and am looking for some help. i have a juewl rio 125 that is currently a cichlid tank. i am planning on the big conversion hopefully some time after xmas. i would like to build a reef tank planning on soft corals a few fish and i like inverts so prob a large clean up crew mainly crabs and snails and one cleaner shrimp. i am also planning on anemones (i love them).... anyways i would like to build a custom sump to go under the cupboard (530mm wide x 260mm deep x 500mm heigh) height is flexible that is the internal dimensions of the cupboard and the space i have to play with i put the maximum height at 500mm as that alows alot of room above that for removal protien skimmer cup or to run pipes etc. i have not chosen any equipment yet except for the external filter and heater because i allready have them running. i would like the sump to be big enough of a place to drain out enough water for a weekley water change and a place to add any chemicals i am planning on haveing the whole back wall of the display tank covered in live rock as much as i can before it either comes out the water or hits an overflow etc (whch is why i wana drain water from the sump and not the main tank during a water change) so i am not to bothered about filtration with that much live rock and an external filter. i am planning on byeing an ro filter aswell so i dont have to go to te shop all the time but this will be plumbed in in the garage away from the tank as there is no room. i will also have a bucket in the garage with a heater and a powerhead in as a place to mix water befor a water change. i am a carpenter by trade so i am not affraid to build things from scratch and have prob got all the tols required. when it comes to geeting the glass cut i have not decided on weather to get it cut from a shop and build it myself or get a custome tank made. any help with this would really help. i have not got a clue where to start and what size to make thigs with buble traps and diffrent compartment sizes etc. i hope there is enough info there. oh yea i am from uk which is why my measurements are in mm and ltrs lol there is about 25mm in an inch if that helps you overseas majority of people lol