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For your fitting you are stuck with 18W or 20W HO which would still only be run at 18W die to your ballast.

To get more light you need to get a different light fitting that allows you to use 2 or 3 T8s. If going via this route then you also have available the option to instead of getting T8 fittings and tubes buy T5 fittings and tubes instead. Even further up the scale you can then get T5HO.

All costs money and there are a huge amount of different units out there al claiming to be the 'best' with wildly exaggerated claims just to confuse you some more. lol

You need to decide whether you want to go with a ow light non CO2 tank and research the methods or upgrade the whole lighting setup.

The non CO2 method would still require you to get a reflector for the T8 you have!!!

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