too much light

I have a 55 gallon freshwater planted aquarium in my high school classroom. We added a heater last week because the tank was getting too cold with the hvac being set to turn off when school is not in session. I guess one of us bumped the timer on the lights b/c the lights were on all day...

Hello, this is my first post :) I need some help. this is my first tank, I have what i was told is a 30gallon tank. i think its a nano cube style? lol. im sorry... noob probs. anyway, i have several plants and things were going well... Then i got a new bulb and shortly after, an algae bloom. Im...