Quote:
|
Originally Posted by Van down by the river
When you were vacuuming did you pull up any smelly (blackish)spots aka: sulphur dioxide? It is a small possibility that you released this into the tank which would have caused the heavy breathing ( but so would released nematocysts).Your circulation would have dissipated it fairly quickly and the larger hardier fish may have been able to tolerate the diluted amounts.
.
|
I did see some blackish spots ( did not notice an odour though ) ... maybe because the smaller fish were hiding in the rockwork ( there is alot of rock ) and also the shrimp dont come out till after the brighter lights go out so they would have been in the rockwork as well
Quote:
|
Originally Posted by Van down by the river
I think that the dramatic changing of sand and 30 gallon water change are most likely the causing culprit. I don't know the full size of your tank but 30gal water change of new water and the stirring of the sand bed could have caused low oxygen levels as well.
I think you will never really know which it was or maybe a combination of some or all of these possibilities.
|
The tank is 300G / sump 70G / Refugium 50G ... with sand and rocks the water volume is probably close to 300G so the water change should have been in the 10% range ... like you said a combination of factors may be involved here ... thanks for your response
Cheers