hmm..did it take affect on your fish?
how many fishes died?
look.. the black algea.. if im correct its thread like and standing striaght in groups right? that means you are giving the aquarium to much lighting lessen it a bit so you can control the cycle, the plants... it seem like your plants curl when they die, just cut them off, you cant do anything
and one more
nice tank you have there ^^ have fun with your fishes