Interesting observation regarding coralline algae

[HawkeyeDJ]

It took well over a year to finally get coralline algae to grow in my 24 gallon AIO cube. I never added any of the coralline additives on the market, just waited for the purple stuff on my snails to take off. I was thrilled because the consensus is that coralline is a sign of a mature, stable tank. Yay!

The CA took off, covering every rock and the back wall. However, I noticed that there was an upper limit to the coralline on the back wall. It abruptly stopped about 4 inches from the top. It is as straight as a ruler, without a single spot of CA above. I first thought maybe it was a lack of light, so I adjusted the light to make sure the top four inches were well lit. It made no difference. The CA refused to grow above this apparently arbitrary line.

Then I finally saw what was causing this strange phenomenon. When I do a water change each week, I remove 5 gallons. That is the line! The coralline apparently cannot tolerate being out of the water, even briefly (20-30 minutes).

Has anyone else noticed this in their tanks?

 

[JGT]

Yep, and if you do have it it will die and turn super fluorescent and then eventually white.

 

[diwit]

It took well over a year to finally get coralline algae to grow in my 24 gallon AIO cube. I never added any of the coralline additives on the market, just waited for the purple stuff on my snails to take off. I was thrilled because the consensus is that coralline is a sign of a mature, stable tank. Yay!

The CA took off, covering every rock and the back wall. However, I noticed that there was an upper limit to the coralline on the back wall. It abruptly stopped about 4 inches from the top. It is as straight as a ruler, without a single spot of CA above. I first thought maybe it was a lack of light, so I adjusted the light to make sure the top four inches were well lit. It made no difference. The CA refused to grow above this apparently arbitrary line.

Then I finally saw what was causing this strange phenomenon. When I do a water change each week, I remove 5 gallons. That is the line! The coralline apparently cannot tolerate being out of the water, even briefly (20-30 minutes).
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Has anyone else noticed this in their tanks?

So in the last week or two I've had a fairly rapid growth of what appears to be bright green coralline algae. From the pictures I've looked at, it is similar. I know its nothing bad, and it kind of looks cool. Can someone tell me what it is there for? I read that it will turn purple eventually? Does it signify anything about my tank? Thanks

 

[Snoopdog]

I guess I never really noticed it dying when out of the water that length of time, something to take note of during water changes. I am pretty quick on water changes though, the water is down maybe 2-3 minutes at the most.

 

[Airwolf]

I've have the same thing on my end, straight line where the water level 'recedes' to when doing water changes.

 

[Stephen Glover]

Mine would turn bright orange after air exposure