ID please

[alexwolf]

What are these? I hope theyre good because theyre spreading like wildfire.....sorry about the last one, its Am's favorite fish ever!

[alexwolf]

1 is the flame hawk, just showing off.........2 and 3 look like a mushroom, but the kind that grow out of the ground. They look like half clam shells.....there is a fuzz around it also. They are EVERYWHERE now though, just wanna make sure they are good!

[MikeP]

pics 2 and 3 are Padina a brown calcerous agae if I'm not mistaken. I think that Lobophora , another encrusting algae can also make the whorl shaped forms but I've seen it mroe often in padina. I have had it on occasion in my tanks but my herbivores seem to like the taste and it rarely grows enough to have the nice shape yours does - I would not worry about it.