Damn my eyes! Flight cancelled, so waiting for the skimmer in the post.
Anyway things stable in the tank. So this weekend went to the local art shop and got a coupl of packets of milliput. This is 2 part epoxy clay that hardens when mixed together and will harden underwater, so is a godsend for aquascaping. Covered the floor with newspaper and got all rock out. I then separated it into 2 piles , separated by surface texture. The smaller pile had a smoother surfce texture than the big. The smaller became a pillar type structure, the rougher surfaced became a blocky , open reef in two parts , linked by a semi cave. Both structures are approx 12 - 14 inches high. They are airy, allowing good waterflow all the way through, and don't take up too much 'floor space'. As they are help together with milliput they are not likely to collapse, it's possible to make more ope structures, and if necessary it's possible to lift them out in one piece for netting fish, cleaning or whatever.
This activity caused a very small ammonia and then nitrate spike but this disappeared in a couple of hours. A day later I put down my substrate, a 1/2 inch or 1 cm or so of oolitic sand. Oolites are little round balls of normally aragonite - if you want to know more, do a google search on them. These are about 2 mm in size I guess.
The tank is now after 10 days getting a nice brown diatom algae bloom. Also if I look in the tank at night I can see quite a few copepods, and some bristleworms.
I have started using invertfood as I want to get some organics in the tank to push along the biological development, and I don't feel there's enoguh organic load at the moment, but I don't feel it's been going anything like long enough yet to add any fish.