hi shoggoth.. how you doing mate,thanks for the reply,im going too up the co2 too yellow like dubud said,then i will start with a 90m midday burst,and see how i go,if that works out ok ,and theres no aglea ishoes,then i will up it slowly say an hour a week,till i get to about a 4 or 5 hour burst....i keep reading on these forum that loads of people are running very high lighting say 4 x 54w and 4 x39w on there 240l tanks,full 8 hours of lighting,and i cant work out how thay are doing these,thay must be running realy realy hi co2,iv only bin doing planted tanks for the last 1 1/2 years,quit new to this hobby,iv tryed uping my light about 4 or 5 times,and every time i get algea ploblems[diotom brown algea]i dont no why this is,my flow in my tank is very good,i can see tiny bubble all over the tank,it must be down to the co2,i think,at the moment my co2 is running at about 3 or 4 maybe 5 bps,too fast to count realy....