Thank you all for quick reply.
Actually, I never test for phosphates and wonder what is the best brand test kit to get ?????
Yes, The nitrate level in this tank used to be very high ( over 100ppm) until I added the refugium 3 weeks ago, 50% PWC
and put the grape calerpa in it to reduce to 20ppm.
Yes, I realize that my tank is a little overstocked, that's why I added a refugium, the water underneath the tank gives an extra 30 gallons and the Blue Devil in the refugium will be gone for adoption (too aggressive toward my flame angel)
As mentioned above, I scrubbed the LR
with a steel brush and rinse with the old salt water but it keeps coming back, I then took some of the rocks and bleach them with boiled water to completely remove the red stuff then put them in the wet/dry sump.
I also plan to buy another 60 lbs of cured Carribbean LR
to replace the LR
I have in the tank but I am afraid the problem will re-appear. Should I bleach the old LR
to completely rid of the red stuff then recycle with the new LR
without disturbing the bio filtration ? any suggestion would be greatly appreciated.