Hi everyone...
Sorry about the lack of response. I lost the thread. Anyway... I changed one of the lights and all seems to be working now
Thanks for the suggestions.
I was replacing one tube every three months so that none of the tubes were older than 1 year, but I must have mixed one of them up.
BTW, the fish that were spitting/splashing at the lights were the blue throat trigger and the blue hippo tang. That is their way of telling me that they are hungry. The blue throat trigger spits or jumps out of the water while the hippo tang swims up to the surface turns around and flaps its tail so that water splashes up.
At any rate, I think the problem is resolved as the lights come on properly now.
Thanks everyone.