"Pszemol" wrote in message
...
"jthread" wrote in message
...
I decided not to put the paver sand or play sand because I thought it
would be ugly and I'd regret it in the long run. I put the Aragonite
right over the old sand. I hope that's OK. Looks real nice now but I have
a skylight there and it likes to grow red slime on the sky light side.
Any pointers on getting rid of it (the slime) are appreciated.

Measure phosphates with a electronic photometer...
If you have anything in the range of 0.05-0.09
than you have too much phosphates and you should
use phosphate removers.

sounds like a light cut down. I was figuring to cut it at 30 min intervals
and see how it goes.

jim