hi nice website ive read ya articles on lighting to much info and now confused please help. i have a jewel 240lts tank with sandard lighting(2x38w)and jewel t5's 2x39.i would like a heavly plant tank and carpet of glosso or similar.would the t5's be ok on there own,or would all 4 better.if all 4 would the t5's be best at the front or rear of the tank.also what bulbs would you recommed as they need replacing.lamp specs shop is nice and cheap or cheaper would be good. many thanks hope to see ya advice. pressure co2 will be used. tank size 4ftx18x16.