Thank you so much for the detailed response! This is super helpful.This is what I have currently for my Millbrook. East facing exposure that's in 70s during day and 60s at night, relative humidity 50-90% depending on weather. Non-foliar watering every other day with distilled or R/O water with K-Lite at 25ppm and Green Jungle 1 tablespoon per gallon at every watering, bi-weekly KelpMax 1 tablespoon per gallon. Flush monthly with distilled or R/O. This one is still in old media and will get repotted to grodan grow cubes next week or so. I think your plant may have come in a mix of grodan grow cubes and perlite.
There's a lot of good options for culture that best fit your conditions and the amount of extra time you have to focus on your phrags. Key points being good water (virtually impossible to over water so long as you have good drainage), a little Cal/Mag, intermediate temps and not too much light. Hardest part is making room for more phrags.
eBay is as good or as bad as the seller.eBay!? Nice.