Lighting Question

[geezer]

I own a 55 gallon tank and currently have two 18" 15 Watt bulbs. I heard this wasn't enough so I did some looking around and these lights were recommended to me.


http/www.bigalsonline.ca/catalog/product...id1=1843;pcid2=

&

http/www.hellolights.com/484xcofraq4x.html

I wondered if the WPG is too high. I think it works out as 4.7 WPG

 

[zig]

Its too high

You wil need CO2 on this tank if you go above 2WPG, i would aim for about 3WPG but you must also properly fertilise this tank if you use that much light. Read the pinned articles, there is one on lighting and one on properly fertilising a highlight tank.

 

[geezer]

Thanks Zig

If I turn two of the bulbs off I could get 130 watts which I think is 2.3 WPG

I looked on the pin threads and see fertiliser mentioned but I can't find what or how to use it. Am I going blind?