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Are the tenticals thin or fat. Fat and stubby and usually green are manjanos. Brown and thin are aptasia. Burgia nudie are the only thing that will eat them. The more you try to kill them, the more they spread. I was gonna order 10 nudies but cant be home for delivery. Maybe I'll see when you're...
Bristleworm. Eats left over garbage in your tank. Will also eat any dead fish or dead snails in your tank that are hidden from you.
Polychaete - Linopherus
Looks more like a Stylophora . Move it to the front of your tank by the glass. Look to see if you find any acro crabs living in the center. They will be hard to see since their so small.
Cap might grow back. If it starts to grow algae on it, it's a goner. Then frag off the good parts. Keep an eye on the frog and hammer. Too early to tell.