Trying to locate a member

[FishHobby99]

I’m want to ask that guy who posted detailed info on nitrate uptake by submerged terrestrial roots a question, but can’t find his unusual username. It’s something like demotheguy. Anyone recall his name or have any suggestions on how I could locate it?
this is one of the pics he posted.

 

[FF_Member146894]

@dasaltemelosguy

 

[FishHobby99]

Nevermind, I found an email of one of his posts I sent myself.