I got the classic "Deer in the headlights look" and I knew I was on my own
I recently asked a lfs (that has lots of coral & sw fish) for some calabration fluid, the guy said what, I said, You know to calibrate a refractometer - he said what a refractometer? After I got the Deer in the headlights look - he said let me get the owner, he came & told me he didn't have any, but he had
thought about buying a refractometer, because he heard they were good at measuring salinity.
I wanted to say - you got to be kidding me right... I just went on looking around his store - with my Deer in the headlights look...
Ok... back to topic - not many run chaeto in the RSM because flow such a key to these AIOs.