Well, that's what I wrote - sea hare eggs. Did someone happen to hatch them? The sea hare is ok, eating as usual, though I can't say there's too much alga around. He is not touching some spots with alga though... I removed eggs right when I saw it, though I think tiny peace is still there super firmly attached to the rock.
Is there anyone who constantly keeps sea hare in the tank? Maybe I could get advise from them? Your help is much appreciated.