Thanks rutz.~
I found my hose for nori is OK. This is consist of nylon fabric not
iron wire. Instread of it, I remove the plastic cup in CA outlet.
I heard many plastic have toxin for material flexibility so If it scratched by even finger nail, toxin can be released in the water.
I found From 3 and 4 days ago My coraline algae are increasing. Do you think it is
good sign? Because During disaster, I can not see the coraline though CA level is not bad.
I checked out the PO4 with hanna colorimeter at night and the value is 0.01
And also I make the new salt water with TMP 10% of Volume to water change