Re: Dark algae beneath gravel
Hi Paul and Cindy!
<<The dark algae is probably a mixture of bluegreens (Cyanobacteria). I see
it all the time, too, ...>>
I really don't have any measurable nitrates and only see the bubbles
every few days so really haven't worries about it too much. I am sure
it is not good, these bubbles, but there are so few.
<< looked up hydrogen sulfide in the Merck Index (a reference book for
chemistry) and it said it smelled like rotten eggs.>>
I haven't noticed any smell at all but with so few of the bubbles, it
would really tax my nose to smell anything<g>.