well all but one of my ponds still are ice covered, that one is opening slowly...then main koi pond had a heater this year, doubled my electric bill for a couple months but DH said it was worth working the overtime to pay for it and see me worry less and have no fish losses as of yet. I have lots of dead loose algae at the bottom that I've dredged out a couple times it looks pretty clear unless the big fish stir up the bottom. Can't wait to get the vaccum out and clean it up, but really don't want to be draining out water onto the frozen ground yet.
Every year mine is a little different, I've had years of clearer water and some of pretty sad looking cloudy pea soup.