Algae is going to grow in the water no matter what. I'm guessing that the person meant that they use fertilized water that has algae growing in it. To be on the safe side I had diluted the fertilizer even further than what I usually use on my orchids. Unfortunately while my Den did make a great comeback during its 2 months in water (4 new canes with lots of roots) and it established itself in a pot well, I lost the plant to rot a few months later.
I actually had these threads these bookmarked ( I have a file where I list all my favorite reference threads) so they were quite easy to pull up once I had time to do it!