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H2S is the bad gas and also the gas that smells like rotten eggs. It is present in all soils. It takes some oxygen to cure it. Bacteria will reduce the H2S if they have oxygen as a nutrient. Plants will release O2 into the soil to help this process. If you have a section of your aquarium that is prone to H2S then planting an emergent plant there should cure your problems. An emergent plant will have good O2 reserves and grow its roots quickly.

Sulfates are part of all water and are not a problem.
 
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