Hydrogen sulfide bubbles - should I worry?
I periodically, once or twice a day, see a bubble of hydrogen sulfide (or methane?) bubble up fom under a piece of mopani wood I have in my tank. Is this an immediate hazard I should address? How toxic is hydrogen sulfide to fish?
I have a 55 with a deep (3-4") layer of ecocomplete. The Mopani wood has a fairly large footprint on the ecocomplete surface creating the dead space underneath. I can smell the sulfur when I bump the wood when cleaning, releasing a bubble or two. I think the bubbles are collecting in a cavity under the wood.
All major parameters are good in this heavily planted tank (pH 6.5-6.7, ammonia=0, nitrite=0, nitrate 2.5-5)
If I need to address it, what's the best way - siphon out from under the wood or just lift the wood out and let the gas release?
I've never noticed this, though I suspect I may have such spots. When I place wood in my tanks, I tend to get them down quite deep into the substrate. I suspect this prevents air pockets, as I turn the wood all over before and during the "burying." Once it is there, it stays. The few times I have moved wood chunks I've not noticed what you describe. If I did, I would get the siphon in one hand, lift up the wood and give a very thorough vacuum to the entire area digging down to the bottom. You can at least do this with Eco-Complete (or gravel) substrates.
Thanks Byron, I was hoping you'd have a suggestion!
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