My tank has been up for over 2 years now....
My first corals were: a rock with 5 'shrooms, a colony of yellow polyps, and a small colony of button polyps.
The mushrooms have grown to over 40 and I regularly harvest them in trade for credit at the lfs. ( I take 3 a month). I didn't start this till last month. They haven't taken over, they just spread from a rock 2 " across to about a 6" circle. They are really crammed in there. When they "let go" and float around I let them settle on the gravel for a day or two, get a good footing and scoop that bit up and head to the store.
My yellow polyps tend to spread more. Went from 3" line to about 5" circle with 3 small colonys in other parts of tank.... it looks like golden grass flowing in the current. No regrets. I take the small colonies in for credit as well.
The buttons are slower. They have spread from 1" circle to 3" circle and are very dense. I split off a piece of colony for experiment and trans planted 4 polyps on a rock... its been 7 months and I have 5 happy polyps.
If you want a weed. Buy xenia. Speads like weed and if you don't have an urchin munching it you can harvest it almost weekly.
Sorry for the ramble... its late. Good luck.
