Thanks to you all. Hey Clownfish4life, the blue one you saw is Velvet Damsel/Neon damsel. I don't have any kind of angel in tank. Velvet is been with me almost year. He is a survivor. He was eaten by puffer.(was laying in the corner with no tail, no fins to swim and so on while it was 1/2".
), but took care of him and now he is around 1 1/2" with only one fin.
BTW tank set up is 75 gal no filter/sump. LR and skimmer only. 5 powerheads with total of 2200 gal/hr and a whisper 5 as water circulation. VHO lightning with total of 360watt. could go for more since home made canopy can hold upto 6 bulbs.
Blue damsel was the 1st one added after 12hrs. The rest were added within 3 day after tank was set up. Moved them from FOWLR tank.