I've had my panda cories (corys?) for just a little over 24hrs. They are in a quarantine tank with a fine sand substrate and the water tends to look cloudy. Is this because they are stirring up the sand? I have the same sand in two tanks with bettas and the water is clear. Also, after exhibiting flashing behavior, one of my pandas passed away. He swam around the top rim of the tank, around and around like it was a race course, constantly trying to keep his nose up, sometimes falling on his back. A short time later, I found him on the bottom, quite dead. I did a water change this morning but fearing there was still something wrong with the water I have now done another water change. Immediately after though, another panda exhibited some flashing behavior and is flitting around, although not to the extent as the other one.
Some details: they are very tiny, an inch or less long, in a 2.5g tank with no filter. The sponge filter I intended to use did not fit so I plan to change the water once a day, twice if need be. I did ammonia tests three times during the course of the day, one API liquid test, one Mardel strip test, and one Jungle Labs strip test. All came back in the clear. I have a heater set to 79* because I am trying to acclimate them to the same temp my bettas are kept at, as they will hopefully be joining one of my bettas. I believe the cory who passed may not have been well to begin with as four of the cories tended to keep together while the fifth was usually in a corner or under the rock decor. Oh, yes. I also used API Stress Coat as my water conditioner and I made sure the temp was within a few degrees of the tank temp for the water changes.
I thought the 2.5g would be large enough for at least a week or two, seeing how tiny they are. However, if anyone advises me differently, can I put them in a 5g for their quarantine? I'm completely new to cory cats so any and all advice is most welcome. Thanks!