Questions - Need some input

My cheato algae has all but dissapeared from my sump and I seem to have green slimey algae in my tank.could new Radions be causing
algae growth? Nitrates near zero Phoshates less than .25. Any ideas?

Our tank seems to have developed a slight film on the waters surface.All thr waters psrameters are good but the film doesn't
Seem to go into the overflows. Any ideas?
Any help is apprrciated.

What is the best way to get rid of tulip anemones ?I
Seem to have a lot if them on one of my
rocks?

I just cleaned out my circ pump intake, and changed the filter socks, emptied my skimmer basket (rinsed the gunk out as usual and the skimmer started overflowing almost immediately, and now I cant get it to go slow enough not to overflow unless I lift the skimmer up by an inch. Any ideas what is happening? all parameters seem good except the nightrate seems a little high at 20-40 ppm. the skimmer seems to have been working properly for months. cleaning the intake on the circ pump really increased ...

I just figured out that my nitrate test kit was not reading right and got a new test kit and it says my nitrate levels are 20-40 ppm. I am going to do a water change right away but I qam wondering if there are any other metods for reducing nitrate. Also is this level of nitrate too high??? my gha is almost gone but there appears to be more brown algae. All the other readings seem good . Thanks Kitch40