Long story short woke up this morning and water was very cloudy. Took a look at the skimmer and it is going crazy making skillet. 100G tank lightly stocked with 2 clowns 1 mandarin and 1 randalls goby. Water perimeters have always been perfect. Get up this morning and water is very cloudy. Just ran a test and Amonia Nitrite at 0 and Nitrate @ 20ppm. I have been dealing with an algae problem off and on. Looks like most algae died off over night. Checked the two tiger counties and both appear to be alive. Goig to do a 10% water change... All I have made up ad ready to go. But unsure wha happened or what caused all the algae to die off... I really hope I don't lose my fish. My daughter will be crushed.