I think Carl has given you good advice. But, my question is, wouldn't you have to unhook your cover all the way around to be able to dribble the bleach all around? Seems to me, that would be a big pain and not worth the trouble. If it can be done easily, then go ahead.
I agree with Carl that you are probably fine for now. Algae isn't likely to grow with water temp of 38. However, both Al and I had slight streaks of algae when our water temps were under 50. In fact, he has a pretty interesting picture on here somewhere where he had algae growing under ice in his pool. During the winters where I do cover my pool, (didn't this year), I will usually go ahead and start running the pump/filter with the cover still on probably in early April. This way I can add bleach through my skimmer if the cl level is too low and keep algae at bay until I do open. Still too early to swim, but like you said, springtime sunshine can cause the water temp to start to rise. That may be something you want to consider doing.
At any rate, I think you are OK for now. Maybe when Al sees this post, he will find his algae and ice pic. Pretty weird!
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