A few drops won't hurt, but if your solution is growing things those dead carcasses are going to wind up on your LPs. If it were me, I'd dump the old stuff and get a fresh batch. Keep it cool and in the dark to prevent future regrowth.
Can a small amount of bleach hurt your records?
I have been using L'Art du Son record cleaner and noticed that a whitish gray bacteria or some kind of growth has developed in my container. I was told that a few drops of bleach might control the problem but could it damage a record?