I have a 60l biorb, I've had 3 male guppies who have been getting on famously and flourishing for the past few months. I have tried adding 2 new males on 2 different occasions and both times they have died very quickly. I am neurotic about testing and I know my water is good, so I put it down to my LFS who have given some pretty shady advice in the past and their guppy tank is also very over stocked.
When I told them that the latest 2 had died (added yesterday, died this morning) they were not interested. I went to a new fs today after a recommendation on here and have now got 3 awesome looking newbies.
The 3 new guys look great an are integrating well, however, one of my oldies, Mr Smee (my fave) has started swimming vertically in the last hour and really seems to be struggling! He had a tiny slit in his tail, literally like 3mm max, but apart from that no visible problems externally. He is the largest fish I have and also has a huge tail.
I dosed the tank with melafix yesterday and today to prepare for newbies, and also added bacteria.
I did a 50% pwc yesterday and parameters are good:
Ph7.6
Ammonia 0
Nitrates 0
Nitrites 5/10ppm
I also added live food for the first time today, could this be to blame? Maybe I added too much?
Any advice would be awesome, I'm literally sitting by the tank keeping my fingers crossed!!
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