Hello. My reef is about 3.5 years old and it's been about 1.5 years since i upgraded to a 125 gallon setup. Since then, i have not been able to control the aquarium at all and the understanding i once thought i had about nutrients and chemistry is seemingly meaningless now. My rock is 100% carpeted in gha and a small layer of ongoing dynoflagellate infestation. I can not raise my nutrients because the gha explodes, and i can not do a water change because the dinos explode. I don't know where to start but i'm really really sick of watching this thing get worse and worse. It's been a long time since i enjoyed watching the reef. Thanks in advance, sorry for not including many details but i'm so beaten by this stupid thing i just don't know where to start.
Fish are fine and healthy, corals have all basically died except the super hardy ones. I have large pieces of monti caps, and a buttload of green palys that are invincible of course. My anemone shrank a long time ago and has been living shrunken for many months. never seen anything like it but it doesn't do any other unhealthy anemone things like lose its grip... its just mini. I have had very low nutrients (nitrate / phosphate) for a long time. I did a water change last weekend to try to get some other salt mix nutrients in the water and the dinos took off.

