Hi.
I might add my 2 cents worth to the spag problem.
I have used it in my early attempts to grow Phallies.
BECAUSE at the club meets the so called expert growers SAID so.
They can afford to run the heat at 25 Deg + all year
I can not and run it as low as 16 deg in winter, THAT is my problem Too cold for wet spag and Phallie roots.
I moved all the Phallies out of live spag into just 15 mm pine bark , NO additives needed adding.
results for me were outstanding.
See photo after about 3 months or so of growth after repotting. Also bonus flower spike
I can water more often without creating problems.
Hope it helps you to work out a method suited to you and your growing conditions.
Cheerio
Ron