I finally bought a barrel for topup water. Got sick of looking around for 2nd hand cheap. Paid $82 + gst for it - still, thats about half of what I got quoted for a similar size by two other companies. I made a stand tonight for it, polyurethaned it up and installed it next to the refugium. the plastic barrel itself holds around 180 litres from memory (maybe a little less) I opted for the largest I could get - got the room so why not. I bought it from rotational plastics in glenfield, north shore, auckland (I'll throw in a free plug because the lady was extremely helpful!) http://www.rotationalplastics.co.nz
It covered all the area's I was looking for - material being plastic, width being less than 550mm, volume being as large as possible and "colour" being opaque so I can check the water level easily. Im in the stage of filling it up, RODI filter has been going for several hours and its only 1/4 full!!! The hose going into it is only a temporary measure until I hook something up properly. Sorry, not the best photo:
Also, heres a shot of the refugium with extra LR. Photo taken at about 11pm so fuge lights are on.