Pond Boss Forums Thread Like Summary - All HBG & Bass Missing: Help Please!

Howdy!
I have a new pond (will be 3 years spring) that had 150 nice HBG and 25 LMB in it for 2 years that were doing great going into this past winter. They ate great last year and they were quite large for 2 years old. I also have 20 CC's in it. I loaded them up on FHM in October like I did the year before.
I run my aerator near shore in the winter to keep a hole in the ice which has worked good both years.
This spring, I found about 10 large HBG and 2 LMB dead after ice out which I removed immediately.
Last year my fish started eating pellets during the last week of April.
So far, I haven't seen a single HBG or LMB but the catfish have been eating good for about 2 weeks. I also use good quality pellet food.
I have also noticed a worse FA bloom around the edges of the pond this year that started last year. It extends out about a foot from the edge on 3 sides of the pond.
Last year I used the Pond Clear, Muck Away, etc kit.

If all of my HBG and LMB are dead, shouldn't they have floated by now? I have tested the water a few times for the normal attributes and everything seems fine.

I use pond dye and have plenty of artificial cover in the pond.

Any ideas what to do or try? I don't really want to stock more until I am sure.
Thanks in advance!

PS. If this is the wrong section of the forum, I apologize. This is my first post!

GT3RS, I've seen incoming rain break the hypolimnium and roll anoxic water, killing CC and others but I don't "think" we are far enough into warm weather for that to be the case yet, but if you've fished hard with several live baits, hard baits and really give it an honest effort, one could say it is possible you have very few if any HBG or LMB left. In certain conditions, the old and very young are the ones to perish-first. I have a pond I manage that had a partial CC kill that we also lost over half of the SMB population and quite a batch of 4 yr old adult BG but when the smoke cleared we still had a fair number of fish the same size as those that died-survive. This was a cold rain event in a non aerated pond so several possibilities for the cause. Sometimes it's hard to find the exact reason.