For the refractometer everyone I've ever seen has doom and gloom warning about not calibrating to zero with Ro, warn against it.
With no first have experience I'm talking out my you know what but going pale and such is a common report of low nutrients. That said the ocean has less than anything we could get to in our glass poop boxes and with the soft doing fine makes you wonder.
Focus and double check the basics. Maybe 10% water change a day for 4-6 days. Don't go crazy in any one direction but do something measured and prudent.
With no first have experience I'm talking out my you know what but going pale and such is a common report of low nutrients. That said the ocean has less than anything we could get to in our glass poop boxes and with the soft doing fine makes you wonder.
Focus and double check the basics. Maybe 10% water change a day for 4-6 days. Don't go crazy in any one direction but do something measured and prudent.
