My sad tank

[vanreefer]

Originally Posted by cuz

oops, I've done 100% water changes and also use tap water with a TDS reading of 200...

As suggested there's probibly other causes, overfeading is usually the most common. Does your tank get natural sunlight in it? due for a bulb change?

Good suggetsions so far...I have usually sem cyano in my tank when my bulbs are due to be changed... how old are your lights?