please try to help identify

[dlwsgirl]

I know these are really bad pictures, but my husband and I can't figure out what these things are, the first picture has a dark purple spot in the center of the picture, this thing has 10 "holes" around the edge and appears to have another protruding hole in the middle. Second picture looks like the same thing only it is black and it is right under the powerhead in a hole. Third picture again, the same thing but this one is a light almost translucent purple and is more round.

If anyone has any idea, I would like to have some input.

Thanks!
Michelle

[dlwsgirl]

Sorry, can't make the pictures big enough to see without making it too big to post. If anyone can help just by the description, I would appreciate it.

[dlwsgirl]

Forgot to tell you that that picture is of the light purple one with a white "circle" of holes on it.

Thanks again!