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I had a nice shot of Markarian's Chain from a couple of years ago,with some bonus galaxies in the background. I also got Comet C/2017 T2 PANSTARRS, M82, and M81 together in the frame a couple of years ago. There are a bunch more, but these were just handy. I've also done timelapses of an...

Canon RAW. From my back yard in Angwin, CA.

Astrophotography, for me. An example: https://www.dropbox.com/s/5144jg0jodg6v41/Andromeda%20not%20too%20shabby.jpg?dl=0

More anecdote: The only tanks I have ever seen hydroids in (and there are many) have been given BBS or adult brine shrimp. I have never seen a hydroid in a tank that I never fed brine shrimp to.

Anecdotally, I've had hydroids appear in tanks where the brine shrimp were just about the only possible source. Back when I was breeding seahorses.

+1 to Tigriopus.

While it's actually difficult to tell from this paper, I think they are attempting to align the bottom of the meniscus with the middle of the line: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3871082/

Correction rygh was correct. In each case, we're dealing with the same volume of air ("20 LPM"). The volume of each bubble varies as the cube of the radius, so bubbles 1/10 the size means there will be 1000 times as many of them. But, the surface area varies as the square of the radius, so...

Given enough time, it will cover every surface of your tank, to the exclusion of everything else. Just my $0.02. Others may have a more gracious perspective.

I find it hard to believe this wasn't posted on April 1st.

Someone more knowledgeable than me please correct me if I'm wrong, but I'm pretty sure that when it comes to equilibrium between atmospheric CO2 and O2 and dissolved CO2 and O2, the CO2 and O2 are entirely different and unrelated systems. The CO2 should reach equilibrium at the same rate...

Really sorry for your loss. 1200 gallons worth of hole is a lot of digging.

Doesn't the water in the overflow generally already experience a fair amount of air exchange as it makes its way down to the sump? It seems as though the big bubbler should be somewhere else where the water is otherwise more still, but of course, salt creep is always a concern when there are...

Most people don't monitor CO2. I was making a point. It is very easy to monitor pH. I'm going to guess from your question that you don't have an Apex or other similar controller, since those all usually monitor pH, and I don't think you'd be asking the question if you had one. Something like...

False, more or less. If everything always goes as planned, and you really "know" that your alk *and* ambient CO2 are stable (how are you monitoring those?), then you don't need to pay attention to pH. But, pH can provide a lot of additional information about the health of the tank, and in...

Thanks! Because of the whole LBGT issue at R2R, I've been jonesing for chemistry forum action. It's built up to a head. I'm getting hives! Seeking all online reef forums with a potential for reef chem threads for some hope of relief Pray for me! EDIT: I also swore off Facebook about six...

Yessir. EDIT: Avatar updated to make it more clear.

Calibrate to 35 PPT.