Anoxic layer in a remote fuge???

tigé21v

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Not sure if this is the correct forum or not. If not, mods please move.
I have a 40 breeder that I use as a remote fuge. No sand, no rocks, nothing but chaeto. Packed with the macro. I usually pull out around 5 gallons every week or 10 days.
The other day, i noticed a "cloudiness" in the corner, looked to be about the bottom inch or so of water. (I have the sides covered, so didn't get a close-up view). I put a maxi jet in it to stir things up a bit, and started to catch the smell of rotten eggs. :confused:
Screenshot_2017-10-24-20-50-01.png
shut the power head off, came back the next day, and pulled a few ml of the cloudy water out and injected it in front of my ORP probe. ORP dropped like a rock. :eek:
Could the water in the 40 breeder really be stratified to the point where there is an oxygen-free zone?? Even with the macro algae completely filling the tank? Granted, it is a very low flow fuge, probably less than 40 gph, and the water comes in at the surface at one end and exits the tank (at the surface) on the other .
20171024_204555.jpg
But still, with all the macro algae in there, wouldn't it seem like an oxygen free zone would be darn near impossible?
I went ahead and drained the entire fuge today. There was lots of detritus on the bottom. Maybe that was using up any available oxygen in that lower level? And boy, did it smell.;Dead
And I went ahead and added a maxi jet plumbed with a spray bar, to pull water from the top few inches of the tank and shoot it down the length of the bottom of the tank, under the chaeto.( Well, that's the goal anyway. Time will tell if it works or not.)
I hope I didn't upset my system too much by doing it. I've had really good success growing the macro, and all in all the system has been just chugging along.
Anyone else running a remote fuge have a similar experience?

TIA
 
Yes, in low flow, the water might get stratified, especially if there is something in the water that is further reducing flow (such as macroalgae strands, bacterial webs, etc.

If it still smells at all of rotten eggs, I'd add some GFO to break down the hydrogen sulfide.
 
Thanks for the reply.
I'm really surprised that one could get a layer of stratification in a volume so small.
No more sulphur smell. Drained the entire fuge, tossed a larger than normal amount of chaeto, and rinsed what I kept.
 
Thanks for the reply.
I'm really surprised that one could get a layer of stratification in a volume so small.
No more sulphur smell. Drained the entire fuge, tossed a larger than normal amount of chaeto, and rinsed what I kept.

I don't think it would if it was open water. I think something likely hindered flow somehow.
 

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