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@UglyEart, I have Biobizz cal mag but when you open the bottle is stinks of eggy farts!!!! :hankey::scream: I used Dolomite lime when I mixed my substrate and occasionally top dress with just a little once or twice a week. Calmag is ordered just waiting on delivery. Can I still use it if it smells of sulphur? Just assumed it would be best to replace. I read that Auto's can be sensitive to nutrients so figured it best to play it safe and wait till I get some more.