sorry im not tread highjacking just asking. i have swords water sprite and couple others. i have pressurized co2 system.i got the milwakke reg i like it alot. i just have a new 90g and i have a light with 4 t5 ho bulbs and i was confused about this chart becasue people have been telling me u must go by wpg than other people use this chart..thats why im confused now.