Rummy Nose Tetras will be my demise

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Have you considered something inside your aquarium killing the new fish? I would advise you to put all new fish into a quarantine tank and monitor them before adding them to your display tank. If I kept losing fish right after buying them, I wouldn’t be eager to put more new fish back into that aquarium.

I’ve introduced some of the rummy nose with other tetras/danios with only the rummy nose dying. Unfortunately due to some current space constraints I live life on the edge and do not quarantine.
 
30-60 minutes works for me too. Usually I will do 60 minutes or longer and do chores in between or watch a show during the acclimation process.

Try a partial water change shortly before you put them in.
I have found a slower acclimation process helps with the survival of new young, small neons. Priscilla tetras are hardy.
 
Rummy nose tetras can be not as hardy as some other species of Tetra. They like acidic, soft water. 65-70 pH, 8dgh, bag peatmoss in filter, or presoak peatmoss-- shouldn't tint the water as much. Driftwood or almond leaves in tank will soften water and lower pH, but may color water somewhat. Crushed shell/coral will also lower ph without tinting water. Planted aquarium, with floating leaves/surface plants, pristine or near pristine water parameters, longer acclimation, external filter, 30% water change weekly additionally contribute to Rummy nose comfort and survival.
 
Crushed shell/coral will also lower ph without tinting water.
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Crushed coral is made of calcium, it actually raises, or at the least maintains pH.
Right sorry, I use crushed shell to maintain cichlid pH. Other items on list, peat, driftwood, almond leaves lower pH.
 
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