Several Phal care questions...

[Lavendula]

Hello all!

I got a new phal a short while ago, and I was going to repot it right away, but the blooms were so beautiful I didn't want to mess with it.
However, a couple days ago I noticed one of the blooms had weird brown sorta rotting spots on its petals. Upon further inspection I found a whack of mealy bugs and their eggs crowded around the base of the flower where the bloom meets the stem.

It took a few hours but I managed to pick all of them off, and every egg I could find (they were even up inside the flower, little bastards!) and then I q-tipped the whole plant with rubbing alcohol, misted the potting mix with it and dusted some cinnamon on top of the potting mix as well (it's a mix of fir bark and these little round thingies I assume are a sort of fertilizer). So far so good. No more pests yet.
Then today I decided to poke around in the potting mix to see if there were anymore pests and I saw this weird blue-green algae type of growth on some of the roots - particularly the roots that are up in the air/sticking out of the medium. Also some clover plants have popped up in the pot over the past few days.

So my questions are:

1. have I done enough to eradicate the pests? Any suggestions or tips on what I should do now, or should have done in the first place?

2. The stem and leaves are very healthy looking, and it has 1 very nice blossom, 1 terribly wilting blossom, and 1 bud still to open. Should I cut off the 1 wilted flower? The whole stem?

3. What do I do about the algae and clover? There doesn't seem to be any other sort of build-up of any kind... do I need to repot?

4. Do I need to cut off the pretty pretty blossoms if I am going to repot?

Any and all help is appreciated!