Ooooh.... keeping SPS without kits.... hold out your hand! Low ca and alk will give slow growth and sometimes RTN if it's chronically low or changed too rapidly... changing a lighting regiment or spectral output usually is the culprit when they lose colour...
It has nothing to do with the Lionfish... 
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135G Mixed Reef. Bullet 2, 25 gal refugium, 2 X250W MH + 4X 96W PC\'s, DIY Calcium Reactor, Coralife 1/6 HP Chiller, Phosban, Tunze, 2 closed loops & SQWD\'s, Seios, Coralife 4 stage RO/DI & a bunch of other expensive gadgets... I may never retire, but I'm gonnahavahelluvanaquarium!
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