Who Gives A Fish Forums

Acros can be picky. What's your alk and calcium sitting at? I've found keeping alk around 8-9 dKH and calcium at 420-450 ppm works best. Also, how's your flow? They need random, turbulent movement to thrive.


My alk is at 7.5 dKH, calcium at 400 ppm. Flow is two Nero 5s on random mode. Maybe I ...

My Acropora frags have been in the tank for three months but aren't showing much growth. I've got a 75-gallon tank with T5 lighting, running at 8 hours daily. Parameters are stable, 8.1 pH, 1.025 salinity, 0 phosphate. Any tips to kickstart growth?

My SPS did the same thing when I switched salts. Are you using the same brand? Some salts have trace elements that SPS love. Also, how often are you feeding? Corals need amino acids and vitamins to keep their colors. I dose Acropower twice a week and see a huge difference.


Yep, salt mix matters ...