Two semi-unrelated questions.

I have a small frag of Zoas in my 20gal long. Had them for a week now. I also had an ammonia spike of 0.25 the past few days. I have done 3 water changes (2gal, 5gal, 5gal today) I have dosed with Prime and also Stability from Seachem. I have seen an improvement in the ammonia level today, it's nearing zero as of 11am today. Since the ammonia spike 1/3 (3-4 heads) of the zoas have completely shut or barely opened for a short period, 1/3 have been partially open and the remaining 1/3 are completely open. Now could this be because of the ammonia? Lighting?



This brings me to my next question I have a Full Spectrum 165W Dimmable LED Aquarium Light. This thing makes the tank glow. At first I was at 50% intensity not I'm running at 75% intensity. Is this adequate lighting for the tank?