I am worried about breeding them because obviously I want more. They are Shwartzi cory cats.Why are you worried about breeding them when they are dying? First of all, you need to get more of them. Cories like being in groups, I would say 8 is a good number. After that, then think about breeding. We don't even know what kind of cories they are.
Where did you order them from and why doesnt the supplier have a policy on dead deliveries?
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Never had a problem with them ( Wetspot) and they have a good reputation.I got them from wetspot tropical fish. They got here alive, it's just that the water smelled weird and the water was like tan colored.
+1 on figuring out what happenedDid the water in your tank smell or did the container corys came in smell?
If it was the smell of roten eggs, then it was the NH4 that killed your corys, or NO2 may be the couse of dead. Do you use testers?
NH4 and NO2 are present when filter is not doing the biological part of cleaning.
You first have to dicover why coryes died and only than you should think about breeding them.
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The easiest way to sex cory cats is by looking at them from above the water. The females will look wider than the males. To induce breeding you feed them heavily for a couple of days or so and then do daily water changes with cooler water. if the water changes are not possible some people have put ice cubes into the tank water at night to cool of the water. You want the cories to think it is cool spring rain making the temps drop so they go into spawn mode. They will lay their eggs on the glass or on spawning mops or floating plants. The eggs are very tough skinned. You can scrape them off the glass or pull the off the spawning mops or plants to put them in your breeding tank. If you leave them in the tank they will become cory snacks. I put my eggs in a breeder box and throw a couple cherry shrimp in with them to keep the eggs clean and as fungus free as possible. they usually hatch in 3-5 days and live off their egg sack the first day. then feed them baby food. your choice what food as long as they eat it. daily water changes are necessary as the babies need pristine water. hope that helps