I'd really doubt you'd find H2S in a tank as new as yours. The roots growing in the substrate should oxidize and and keep the H2S at bay.
The green water conditions you are getting are triggered by ammonia presence. I've fought with it in the past, and overcame it with a blackout, and proper filtration. I'm using an XP2 on my 29 gallon tank now, and have not had green water since.
Sorry to hear about your barb and loaches. I know you were attached to those fish after having them so long.
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