Additional LED?

[jason604]

I'm planning on ordering the WP40 on Boxing Day and I have my Levites at about 60% I turned down blue so I can take better pic they normally at 70%. I'm using a euro reef 125 rs skimmer and my system is a high nutrient one. I stopped doing water test but last time I check my nitrate was 10-15ppm. I keep hearing about calcium reactors. Are they worth getting and how do they work? Do they cause tank crashes and what equipment do I need to buy to make them work?