Gang@ukps This morning I decided to remove some of my mature and add in some new media ( I am in the process of colonize filter media from my EX1200 into my 2080). Anyway I refilled my 2080 with existing tank water 25 litres or approx. 1.5" was required to refill the filter and for the first time my plants pearled - this got me thinking that by having a reduction in depth of water allowed the light to penetrate deeper so I am right in thinking that I need to improve my lighting - currently I have 2 x 30 watt T8 tube @ 6000K and 1 x 24 watt T8 tube @ 4900K - approx ltr of tank is 217 depth of tank 18". If I renew my lighting system it will have to be a new unit (sits on the side of the tank or a pendant type) or does anybody know of greater wattage tubes with a high K rating (T8) that I can purchase. Regards paul.