Moorish Idol - Take 2

[Samw]

No not extreme. Most other fish can tolerate these levels because it is not extreme. That's the point. Different fish have different tolerances to hypoxia.

[gobytron]

Originally Posted by Samw

No not extreme. Most other fish can tolerate because it is not extreme. That's the point. Different fish have different tolerances to hypoxia.

The fishes you have reported dying have extreme sensitivity.
not sure if you read that right (or I typed it right).

[Samw]

Originally Posted by gobytron

The fishes you have reported dying have extreme sensitivity.
not sure if you read that right (or I typed it right).

Yup. that's what I said. The fish that are dying are extremely sensitive. But the conditions are not extreme. For example (i'm making these numbers up of course) most fish can survive under 50% DO saturation. Because most fish can survive at 50% saturation, this level is not considered extremely low. However MI and dwarf angels can not. So they are extremely sensitive. I made those numbers up to illustrate my point of course. I would have to measure the DO to know exactly at what point the MI starts to suffocate while all other fish do not. But it is probably at some level that most people do not think their tank is low on DO. DO fluctuates wildly depending on many factors. I've measured 40% before in my old system with airstone skimmer on with no deaths. My old system went as high as 130% during supersaturation by photosynthesis. With my current system, the lowest it'll get is 80% and the max is 98%. I'm sure that when I experienced the deaths overnight with aeration off, DO was well below 40%.

[Samw]

Originally Posted by gobytron

The fishes you have reported dying have extreme sensitivity.
not sure if you read that right (or I typed it right).

Sorry, you are right. The fish are extremely sensitive. I misread that the first time. The conditions do not need to be extreme.

[Aquattro]

Ok, no more O2 in this thread, I'm suffocating. hahha

So far, MI doesn't appear to be developing ich as I feared last night. Feeding some ich shield just in case.

[tytown]

So it's been over 3 hours without the skimmer running and circulating pumps at around 60%.
I can't say as I see any ill effects but I'm not going to carry it on through the night. Maybe someone else wants to try that...haha
Though far from conclusive I would say that I would be comfortable having run my system for a day or two without a skimmer. My fuge lights went on in the last 45 minutes so this adds another angle of discrepancy to the test.

Back to MI eating habits, does yours even go near that Ick shield? I tried feeding that to my display and not even my clown trigger would go near it!!!

[Samw]

Cool cool. Glad I was wrong on this. !

[Aquattro]

Originally Posted by tytown

Back to MI eating habits, does yours even go near that Ick shield? I tried feeding that to my display and not even my clown trigger would go near it!!!

Ya, went right at it. I'm surprised, people told me fish often didn't like it.

[Aquattro]

Thursday update (it's Thursday, right?). MI and his Anthias buddies are all doing well, eating like pigs.
MI still has the same single whit spot, inclined to think not ich. Not sure, he won't stay still long enough to get a good look.

That's it. Simple update