What kind of lighting is it under? It looks like it might be stretching towards the light, possibly indicating insufficient intensity.
Mine do this all the time, and my lighting is strong
yea its probably your lighting. atleast yours will host clowns....
Mine do this from time to time also, i believe its normal, at least for my tank it is.
Sorry off topic but do your maxi and haddoni touch with no problems? Looking at getting one but don't want them to irritate each other.