So I was inspecting my tank the other day and came across something new. Then today I found another. One is about 1/2" the other 1/4" after doing some searching I am pretty sure they are Pseudocorynactis, or White Ball Corallimorph. There seam to be mixed reviews whether they are ok to have in a tank or not. So just looking for opinions on here, and if they are bad, how to elimate them. Here is a picture. (Not my tank, but same thing)