Was this new rock? Not sure why you got so much PO4 so soon. Lights probably didn't help with algae. Anemones always get sucked into pumps. Fact of life
Your clowns seldom approve of anemone.
Water changes every few days is a bit overkill. Larger less frequent are better. Also better than adding lots of removers and adders and takerawayers.
Butterflies are delicate, often end up dying.
I'd get a RO unit, do water changes every 2 weeks. 25% or more. I like to run carbon, some don't. I don't use any other filter media. Get a better light, not sure I'd trust that one. Not enough for coral, and probably good at growing algae. Not sure what kind of skimmer you have, suspect it's not good enough. Generally "not bad, but ok" will not be enough for a reef.