Need some advice/help with phosphate, I’m changing out my gfo (rowaphos) every 3 days. I tried using phosrx but don’t like to use it much because of the tangs. What would cause phosphate to raise fast? Tank is 3 years old, Could I be overstocked? Tank is a 6 foot 125 approximately 110 total water with yellow tang, moorish idol, yellow belly tang, melanurus wrasse, magnificent foxface, 2 clownfish, blonde naso, long nose wrasse, copper band, 4 green chromis, cleaner wrasse.