thanks guys.the key to reef keeping is research and dont be afraid to ask,if it stops one disaster its worth it.you can set up a smallish tank for a minimal outlay(if you go second hand)but remember buy the best equipment you can afford,buy cheap buy twice,trust me i found out the hard way,a good quality second hand skimmer is better than a low quality new one,deltec=top quality,so a second hand apf600 with feed pump can be had for £120 usually,the cheap ebay ones arent worth the box they come in,tqake your time build up your equipment then set out building your reef,regards mikk