Surface film causing deaths?

southerndesert · Post by **southerndesert** » Mon Nov 26, 2007 2:31 pm

Hi All,

I made a post a few days back about losing some of my IZ Shrimp while the Malaya seemed unaffected....

After some serious thought I began to wonder what was different if anything about this tank? It is a 15 tall and other than that not much difference except it had only a HOB filter with a intake sponge.

The other 3 Shrimp only tanks I have have either a HOB or Canister filter with filter sponge plus a air stone driven sponge filter.

Where am I going with this? Well the air bubbles from the sponge filters was keeping a layer of film from forming on the surface allowing for better gas exchange, but the tank with problems had a film on top due to very little surface movement from the HOB outlet. Could lack of oxygen have been a factor here?

After adding a air driven sponge to the tank my shrimp immediately got more active and today are looking as though they haven't a care in the world and so far no more deaths. The most dramatic thing was their behavior after the film was gone...almost...well...joyous.

Thought I'd get a few thoughts on my theory...

Bill

badflash · Post by **badflash** » Mon Nov 26, 2007 2:49 pm

Air exchange is essential. If nothing breaks the surface you end up with a protein/oil scum on the top. Not only does oxygen not get in, but bad gasses can't get out.

I'd say you are on the right track.

southerndesert · Post by **southerndesert** » Mon Nov 26, 2007 3:11 pm

And it was your input that set me to thinking...Thanks and I hope indeed I am on the right track. For now crossing my fingers and keeping a close watch.

Lessons are somewhat hard learned in this hobby.....

Bill

badflash · Post by **badflash** » Mon Nov 26, 2007 5:47 pm

Boy, you are right about that!

AlexMC · Post by **AlexMC** » Tue Nov 27, 2007 7:22 am

Thanks for posting, Now I can see what was my problem