ok i have a rio 400 5ft tank with two light bars twin 54w t5 and the original twin t8 36w (I think), Anyway although i am not really unhappy with things access is a nightmere i have to remove 2 flaps and one light unit to get in, so decided i would get the arcadia 5ft with 4x 54w t5's only slightly up on my old lights so it would be an easy to deal with change, but every one has now run out of the old type which were between £210 -£270. The new ones are 4 x 80w t5 is that like really overkill on my tank, would i be asking for major problems if i went down that route?. Not exactly sure what my wpg is at the min as i never know weather to use us gallons or uk gallon for the calclation but think i am around 2.5wpg and the new arcadia would be around 3.5wpg. I have cheap luminaires on other tanks but with this being the main tank and being so large i had hoped to get a branded one. Any advise would be greatfully recieved. thanks Karl