Coraline algae stops at water change line

[mrbacony]

So here is a pic of my tank. As you can see, the coraline algae does not grow past a certain point in my tank. This happens to be the line my water comes to when I do a water change. The water is only that low for about 15 minutes or so until I refill the tank.
Does this happen to anyone else? My nano tank does not have this issue. Only my larger tank. Strange.

 

[Utubereefer]

I don’t have Coraline on my back glass. Looks cool tho

 

[reddevilant]

I'm not totally sure but I think I've read somewhere that coralline is not too tolerant of being exposed to the air. So maybe that's why?

 

[homer1475]

Mines the same. I don't notice as much as you as I have urchins that eat the coralline on the back glass anyways.

 

[Lost in the Sauce]

You are exposing the Coraline for air for too long and it's killing it off During a water change. It doesn't happen in your nano because it takes a lot less time to do a smaller water change.

 

[muzikalmatt]

You are exposing the Coraline for air for too long and it's killing it off During a water change. It doesn't happen in your nano because it takes a lot less time to do a smaller water change.

This. I have a 40 gallon AIO and my back wall is covered in coralline algae up to the main waterline. When doing water changes half of the wall is exposed but probably for a maximum of 1-2 minutes. I typically have my fresh saltwater ready to be pumped into the tank as soon as I remove the dirty water. That way it minimizes the amount of time my corals are exposed to the air.

 

[New&no clue]

It use to do it on my old tank, my new one has a faster water change and I don't notice the line.

 

[mrbacony]

Crazy to think that 15-20 minutes of exposure every 2 weeks would kill off the coraline. I figured that was the cause but just hard to believe

 

[Mr. Mojo Rising]

I have the same line on my coraline on the back wall. For me, I think it cant grow higher becuase its not enough light, I mean from the angle of the light doesnt allow it to grow higher it has to grow down. Do you know what I mean?

 

[Midrats]

Ditto here. 15 minutes will do it.

 

[Lyss]

I have noticed definite die-off on what’s exposed during a water change, even for just a few minutes, but it always grows back, then dies off again after a water change. On areas I really want to preserve I splash tank water on it periodically while it’s exposed.

 

[attiland]

Mine doesn’t do this. Having said that I change water less frequently