Akasha72 said:okay, I think I've understood most of that and from my observances of my fish it all makes sense. Certain fish in my tank seem to like the light, other tend to like shade. Curviceps is one fish often found shading in the plants and brought out into the open and their colours fade a little. Their natural enviroment is blackwater so that makes sense.
My tank has two T8 tubes. One for plantlife the other a daylight bulb. These seem to work well for plant growth etc. I have two reg tiger lotus plants in my tank and I do sometimes allow them to reach the surface and float there but I need to prune them often or they will outcompete my other plants. It's a delicate balance. I think given what I've understood from your write-up I'm going to allow a few more lotus leaves to float on the surface and see if it makes any difference to the fish
I'd say you're doing fine. Yes, it is always interesting to me to see how fish respond when given options, whether lighting or water current.
I like T8 lighting, mainly because I understand it and it has worked for me for 20+ years. My temporary foray into T5 and LED a year or so back was due to my T8 fixture on the 5-foot tank giving out. Eventually I bought a T8 dual tube shop light that would fit the housing, and now have a brand new T8. You can't get these any longer, at least not in NA, as everyone is either into T5 or now LED. B.