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I recently brought three mollies i already had a betta and 6 rummy nose tetras in a 200l tank its been 2 days ruffly and all my rummies died well 5 of them does anyone know maybe y this has happened
What are your water parameters? I would hazard a guess that they either died from a water quality issue, a PH issue (PH may have been too alkaline for them) improper care at the fish store, or a possible disease. I hope not the latter, as it could affect your other fish as well. It's a good idea to quarantine new fish before adding them to your main tank in case the new fish have the potential to spread a condition to the rest of the tank.