Who Gives A Fish Forums

Final thought: if you're still not happy after all this, consider adding a single UV bulb. It's niche, but some swear by it for reds and oranges. Just don't overdo it—5% max.

Bulb age and spectrum matter, but don't overlook water quality. What's your alkalinity at? Acros need stable alk above 8 dKH to color up properly. Mine sit at 9.5 dKH, 450 PAR, and they're neon under T5s.