My rays are all dying :(

[burbon44s]

Man that really sucks! Sorry for your loss. Big factor i think ,would be ph. Ph shock kills quick. Are you using test strips or drops? I was using test strips and they were giving me wrong readings. Just an idea

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[aquaman45]

If you live in an area where the mineral content is low(soft water) then its very common for a sudden Ph crash especially when feeding heavily as we do with our rays.You never mentioned checking the Ph? the obvious is often overlooked in cases like this. My water is soft, I use coral gravel to keep it buffered in between water changes, I have lost many a good ray in my early learning days due to this common problem (Ph crash).
The first sign of Ph crash is a loss of appetite, secondly you will notice accelerated respiration (spiracles beating fast), the ray will also become inactive during this time........did you notice any of these signs?
If left for more than a day in this state the results are hard to reverse.
It is true that many fish can tolerate high nitrate(N03) if exposed to it gradually but like I mentioned before if your water is soft to start with there are less minerals, minerals are used up in the nitrification process hence a sudden Ph crash, people in hard water areas can go longer in between water changes without noticing they have very high nitrate, unfortunately many of us only check levels once its too late.

Sorry to hear of your loss.

 

[jstavis]

Did you check if there is any stray current coming from the pumps or heaters..dont know if that's an issue in saltwater, but has been known to cause problems with saltwater sharks and rays

No, I haven't checked that. How would I go about doing that.

 

[jstavis]

I am using API liquid PH tests, not strips. PH has been high, but stable. Our water is extremely hard, not soft.

 

[Raymann88]

My water is hard here too. One of the reasons I do smaller water changes more frequently. 50% water change at a time can be quite a shock to the rays -especially if water parameters are different between source and tank. Have you checked both tank and source water to compare? You may find your answer to the cause.

 

[snake8myelbo]

Sounds like a parasite to me?

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[calgaryflames]

Is their any plastics in the tank any DIY stuff you've done ?

 

[calgaryflames]

It's probably not parasites and don't randomly medicate .

 

[Energy]

It's not ammonia, Not nitrite and probably not nitrate as that level hasn't changed.

Any new foods that could have had a toxin in them?

Chlorine or Chloramine? Have you tested for this?

An Airborne contaminate can be reduced with extra Carbon- which will also remove chlorine/chloramine.

Worse case scenario I am in Minneapolis MN and can take the rays until you resolve the mystery.

 

[Pyramid_Party]

Tank temp? Are any aerosols being used in the house (room air fresheners/oven cleaner). Heated fragrance oils? Before the losses began did anyone do any house cleaning (spray cleaners, furniture polish, etc.)? Is anyone smoking in the house? All these can contribute to a sudden toxicity reaction in an aquarium.

I was just going to say this. Some people probably even think something sprayed in another room wouldn't be a problem but those molecules travel through the air and can reach another room. The other possibility is maybe some bad food was fed to the fish and they all got sick. Whenever I hear problems like these they are not the usually routine problems like water parameters.