I need urgent help - I'm about to loose another fish
I have a 95 litres established tank - it contains wood rock and plants ( lots of plants )
over the past few weeks I have had a recurring problem that I cannot find the solution to and tonight I am about to loose my Sailfin male.
in short the scenario is this ........ every 4 - 5 days a fish will go down and when I say go down I say literally with hours. it is always the same sequence - fish is fine .... fish sits on the bottom - fish leans over - fish dies
there is no consistency with the type of fish - Ive had Guorami's, sword tails, tetras ..... the perplexing part is that I trend to have a male and female of each and whilst one will die the other is fine - my sick sailfin is the male for example but his pregnant female of perfectly fine. the sword tail was female - fine at 10.30 by 4 pm she was dead - the male is fine
I religiously test the water every other day and it is fine - I have taken it to various aquatics centres to be tested in case I am missing something and they cannot find anything wrong with it. I do regular water changes of 20 % with the appropriate Tap safe added. the water in the tank is perfect.
the temperature is a constant 26 C ( I have a digital prope thermometer )
there is a tank length aerator and a long block one too
I have removed the snails and they are presently living in another tank
I had in the tank
6 x Tetras 2 x honey dwarf gourami I flame dwarf gourami 2 blue gourami 2 red dwarf gouramis' 2 sail fins 2 sword tails 4 small rams 2 small rosie barbs
I have lost the female sword tail, both blue gouramis' ( which died weeks apart ), both red gouramis', one tetra and now the male sailfin.
the fish have come from different outlets I have added salt
I added melafix - made no difference
Esher 2000 ( having removed everything previously with active carbon filters )
the fish that die have no sign at all of any illness - they do not have any damage to fins or tails - I have had a 'scrape' done on a recently dead one with negative results for anything
they are fed tropical flakes and once a week either blood worms or shrimp lavae - both clearly state they are suitable for all tropical fish
I'm at a total loss as to what is going on and I do not want to loose any more fish