OK I think this is what happened to the tank
Green Water
The green water, often referred to as "cloudy water or pea soup", which makes your fish disappear right in front of your eyes, is an algae bloom. Free floating planktonic single celled algae growing at a rate that turns the water green.
green water and water changes in the aquariumThe cause is always the same, too much light and excess nutrients (nitrates) often resulting from overfeeding. Excessive light cannot only be attributed to the aquarium lighting but also intense room lighting and direct sunlight.
Keeping nutrients low can prevent green water, while water changes provide little to no help in clearing the water. The algae spores are readily available in the water, including most waters used for changes. These spores will thrive in nutrient rich water, adding to the deterioration of the visual appeal. An algae bloom can become so severe that the content of your aquarium can literally vanish in the green water.
Some insist that turning off the lights will eliminate the problem, only to add that the problem just keeps re-occurring. So this hardly seems like a solution.
Algae will consume oxygen at night during photosynthesis. A severe algae bloom can deplete the tank of oxygen, so adequate oxygenation must be provided during the light off period.
Dying organic matter creates phosphates, so the filter should be rinsed more frequently during an algae bloom, eliminating some of the decaying matter. Vacuuming the gravel will also help.
This sucks I can't even look at the tank.... I think, I left the light on a few days way too long....