Losing fish

move the rocks around. there might be a crab or mantis shrimp, brook has tell tale signs and cant kill that fast
Brook can kill overnight, though it sometimes takes slightly longer. In this case, a mantis shrimp or hitchhiker being the cause is extremely unlikely.
 
I'll get what I need to calibrate it this way today. I'll report back to see if that contributed
Or, for a quicker answer, take your refractometer to your LFS and test their salinity... If it reads the correct SG (often fish stores do keep theirs lower), then at least you will know how far off your water is now.
Long term, you do need a reliable way to calibrate. I know my refractometer has specific instructions to calibrate with distilled water, so maybe different brands calibrate differently.
(I also have a glass hydrometer that I use too... Allows me to double check my refractometer :) )
 
Or, for a quicker answer, take your refractometer to your LFS and test their salinity... If it reads the correct SG (often fish stores do keep theirs lower), then at least you will know how far off your water is now.
Long term, you do need a reliable way to calibrate. I know my refractometer has specific instructions to calibrate with distilled water, so maybe different brands calibrate differently.
(I also have a glass hydrometer that I use too... Allows me to double check my refractometer :) )
It'd be faster to get what I need to follow the instructions posted than to get water from my lfs lol
 
Or, for a quicker answer, take your refractometer to your LFS and test their salinity... If it reads the correct SG (often fish stores do keep theirs lower), then at least you will know how far off your water is now.
Long term, you do need a reliable way to calibrate. I know my refractometer has specific instructions to calibrate with distilled water, so maybe different brands calibrate differently.
(I also have a glass hydrometer that I use too... Allows me to double check my refractometer :) )
Unless it is specificly made for salt water at 35sg, directions are fine. But most are made for brine water and the directions will tell you to use distilled or 0 tds water. Calibrated to that will give you a miss reading at 35 sg. It is always better to calibrate closer to what your reading regardless. Just need to get a known standard.
 
I have had velvet kill that quick and show next to nothing on the body of the fish. It is a parasite and you will still need to take your tank fallow.

Best thing to do is get a 10 gallon quarantine tank also for your future fish. I have learned the hard way too that it is best to be safe rather than sorry.

 

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