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Posted by Steve: BUT I have not seen it in every tank that has a MH bulb, intact some tanks I have seen that have had the "shimmer" did not have it at other times. Other MH tanks I have seen had no "shimmer" what so ever... so there is no way that you can tell me that by adding a MH you are going to have "shimmer”... I don't think it is that easy and that there has to be some other factors to go along with the lighting.
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<font size="2" face="Verdana, Helvetica, sans-serif">Has a lot/all to do with the amount of surface agitation. I've never seen a MH tank without glimmer lines unless the water was calm at the surface. I've seen faint lines with VHO but nothing like the beautiful lines you get with MH.
[ 06 June 2002, 23:13: Message edited by: Troy F ]