on my tank you saw im just using a hob with purigen as i have a large skimmer and the tank is only temporary and too small to house the skimmer but an additional option could be a small skimmer like http://www.trademe.co.nz/Pets-animals/Fish/Pumps-filters/auction-385259428.htm from organism or a bubble magus one like the bm-qq. also if you want to look at leds have a look at lee tak neon and sign on blenheim road he has high power leds in different colours even a 10w one he sells mr16 and gu10 led bulbs in various wattages and colours also. a diy fuge could be a container that is higher than the tank and sits on the stand behind the tank, with a sort of spout made so that the water overflows gently into the tank(think HOB style filter) then a samll powerhead pumping from the tank to the container , slap a light on it and your done nice and simple