Looks like you are off to a good start in terms of equipment and stocking. I’ll repeat what others have already said, you should test your alkalinity, calcium, nitrate and phosphate (assuming your salinity is stable) before blindly making adjustments.
However, from the sound of things, you don’t currently have a demanding load your elements since you only have a handful of frags in a 130g. This being said, I doubt your calcium would be a cause for the coral bleaching/fading. Right now regular water changes would be the easiest, and since you’re not testing, the best way to keep things stable. I’m also not familiar with the Nicrew lights, but having them both set to a max of 30% is a pretty low intensity. This would only be a total of 90w over a 4-foot tank, which is equivalent to about 2 T5 bulbs. Shy of knowing your par levels or how everything is set-up, I’d say increase your lights to >60% to help reduce loss.
There could be a number of reasons for fish loss. What do you feed, and how often do you feed?