Some SPS loose some colors. I think I found the issue with low nutrient system. I found that alk is alway fall very fast even with Kalk dosing as water replacement. I have to dose alk to bring it up to normal and PH fall low at night and goes high in the day time. What I did was dose soda ash at night to bring alk and ph up. I also found dosing potassium is another key from bring the coral back to health.

Some of my pale/STN SPS stop STN and getting it color back and growing back.


I am sure there are other elements are missing in the water. I do some water change to replace missing element, but keep alk,cal,mg,ph,potassium high and stable is the key. Feeding coral is key too (ie add some nutrient in the water)


I did have problem with phospate and low nitrate where it cause dyno and red slime bacteria/algae that kill a few nice sps. I have to add GFO to kill them off. Now N is low and P is zero.

The acutal hair algae or any other green algae is non existance.

I am very encurage with potassium dosing that bring the color back and increase growth in SPS.

Adding other type of SPS next week.

currently looking for auto dosing method to minimize low alk and ph.

I will post more info on what other trace element needed.
Right now the key is Potassium....(N,P,K) these three elements are key to growth. Need to know how to control them just like alk,cal,mg,ph