I have a 42 littres tank 60cmx30x25 and for 4 months I had inside 2 silver sharks, a gold gurami a molly and a platy with no significant problems. Just a week ago I decided to go the aquarium shop and see if I can get some more fish. The "expert" :x there told me that since my system is working fine I could put more fish and suggested 8 small platys (1.3cm) each.
Now after 1 week my old molly and platy and a silver shark died already and my other shark and gurami are straggling to survive. The other new platies seem fine.
Please help me? What can I do to save them? Did I raise the level of ammonia by putting to many fish instantly? I did two partial changes and added some Waterlife bacteria additions maybe they can help my filtration system. Is there something more I can do? I didn't feed them today.
Now after 1 week my old molly and platy and a silver shark died already and my other shark and gurami are straggling to survive. The other new platies seem fine.
Please help me? What can I do to save them? Did I raise the level of ammonia by putting to many fish instantly? I did two partial changes and added some Waterlife bacteria additions maybe they can help my filtration system. Is there something more I can do? I didn't feed them today.