Fast,
Yes, I have had similar issues from time to time. For me I would say the larger issue is water flow, skimmer break down (and then lazyness to get the new one set up
![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
).
I have a bit more lighting than you, the 6 tec on a 75.
You have a much more varied selection of corals than I. So, I can not comment on all the specific corals.
ZOAs are about the only hard ones to tell. Some of them dig it at the top, some like it at the bottom, in a cave, behind a hermit crab. It can be frusterating to know when to move them and give them time to aclimate. I lost two great looking colonies a way back. Now, I just start them at the bottom or in a sick tank with the HD lights, then move them up.
The 3 SPS corals I have have never had a problem. I started them right at the top.
FROG/HAMMER. Started in the center, and I have never tried anything else. The frog is verysensitive to waterflow and condition. I have some pieces of hammer drop to the bottom and I may be lazy to pick them up.... They do fine on the bottom (BB tank, probably a bit brighter than a sand tank).
I have some sort of brain. I have kept him in other attached tanks, and while my other corals do not mind, he does. I keep him partially shaded, I suspect, with all things being neerly equal, he really likes the t5 or the deep water.
................
Shrooms and rics, fungia, some of my zoa, gsp, pipeorgan... could care less if they are in my refuge with a HD 6500k skrew in bulb or not.
..................
My set up is not the new popular method to go. I still have the 2 blue (not sure which blue), 3 GE Day, 1 atinic combo.
I only run 3 days and 1 atinic for 6 hours a day and run the two blues for 12 hours. My toadstool is almost at the botom and comes out more in the morning and evening. I asume he just does not like the full blast.
For a couple of weeks I kept about half my corals at the top. Mushrooms could care less where they were. Some of the zoa did not dig it. The toadstool was not happy at all.
Well, thats all I can think of. I hope some of this helps.
................................................................................................
Short answer is: T5s are bright enough to bother some corals too high up, and grow any coral if you get them close enough to the surface.
You don't need ALL fancy expensive bulbs.
More importiantly than light, is the water quality and a nice medium to high water flow IMO.
:bum: