I have a toadstool that is about 3 years old. It’s about 20 inches wide. About 6 months ago I started noticing white botches just a few. It did really affect the leather it still fully opened, and you could only see them during water changes when the leather was closed. It has progressively gotten worse but the leather still opens fully. It is starting to look really bad. Does anyone know what this might be and how can I fix it. Everything else in the tank looks excellent!
Alk 8.8
Cal 410
Mag 1380
Nitrate 10
Nitrite 0
Phosphate.08
450 gallon mixed reef
Two RedSea 45 wave makers
Two Ecotech Vectra L2 return pumps 4 return lines
Phosphate reactor
Refugium
Water change every 2 weeks
Carbon change every 2 weeks
Alk 8.8
Cal 410
Mag 1380
Nitrate 10
Nitrite 0
Phosphate.08
450 gallon mixed reef
Two RedSea 45 wave makers
Two Ecotech Vectra L2 return pumps 4 return lines
Phosphate reactor
Refugium
Water change every 2 weeks
Carbon change every 2 weeks