I few tips that may help:
- Get your Alk back up! If left low for an extended time you'll get all kinds of issues.
- Flow. Millies and Acros usually like lots of flow. Get more flow on it and see if you get better polyp extension.
- Light. Maybe the corals are just too high up in your tank, causing them to fade or change colour?
- Coral on the way out. I've got great corals, but I've lost more then I care to admit. Some were big healthy colonies that died for no real reason.
More than likely its your low Alk. As for the soft tips, most new growth is quite soft and hards up over time.
Good Luck!
Kelly
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