Is this something I can still fix ?or is tearing the tank down the only way to fix? besides those anemone I also have flat worm ,aptasia,aptasia asteria star
If you can remove the LR you can scrap off the aptasia and manjos. As for the asteria star, you can try and just pick them out. For the flat worms try to siphon them out or just flat worm exist.
How big of a tank do you have? For aiptasia try a healthy copperband. In a month or 2 it wil start to eat them. I only suggest a copperband for you because you are a expierenced reefer. For asterina stars get a harlequin shrimp. For the manjanos the copperband may eat them but most likely not, you can try aiotasia X or Kalk paste. Don't take drastic measures. Put in the work for 2 months and see what happens. Before you so all the above, if it's the red flatworms get flatworm exit by salifert and take care of them first
You can follow above advice. Which is good. But most likely in two months your not be happy. If it was me I would tear it down . Learn from your mistake. Have a peace of mind knowing your doing it right. Make sure you kill all those pest. In long run you know you had do this.
Peppermint shrimp worked for me with aptasia and I had a bunch I had two in a 29 gallon 1 ate it the other just would laid eggs for the other fish to eat