sulfur denitrator? too good to be true?

OK, trying a homemade one from miracles38 on my live rock holding tank. It had an ammonia spike so I'll be monitoring to see if it helps any. One thing though, first starting it it gave off the smell of hydrogen sulfide (P.U.! It wasn't me!). Went away after about an hour though.

(if anybody else uses one of these, start them outside, or blame it on the dog! LOL)
 
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