No it isn't safe to get in a pool with algae. If there is algae then there can be pretty much anything else in the water as well. It isn't likely to kill you, but it could have unpleasant effects. Try shocking the pool with only the brushing you can do from outside the pool and see if you can get it to hold at least some chlorine level before you get in it.
Keeping the cover on will slow the growth of the algae dramatically but it won't kill it. I would leave the cover on till you are ready to deal with it and then do everything at once (cover off, fight algae).
is it possible I still have algae and not know it? Pool looks crystal clear, chlorinator on max. Normally I can have it
set on 2 (1-9) I'm only getting .5 of FC I'm adding ultra bleach every couple of hours. I brushed the whole pool.
The pucks are dissolving. pump running 24/7
It does take a few hours for the FC to drop that low after dumping the bleach in
could it be my cya is inaccurate? The pool store also tested it and got the same results as I did