I have reduced the lighting on one light unit down to 3 hours and kept the other at 9 hours as the lights just seemed too bright.
I found this General information article [PDF] on Philips ‘T5 and T5 HO lamps one of the best sources of information available. It explains and contrasts the luminescence of T5, T5 HO and T8
http://home.zonnet.nl/rsetteur/aquarium/tl5_manual.pdf#search='Philips%20AND%20Tl%20%275%20HO'









Newbie to not only planted tanks but forum lah.....I can't pm you, but my email is
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probably the hard water vs soft water change? Anyway they passed away one by one, they seemed to be eating and didn't want to escape except one which I found to late. I never did find out what king of crabs they were … which reminds me there is still one being preserved deep in the freezer somewhere!










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