Answer as many of these questions as you can please hun then i can help you
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Tank size: 120 litres
pH: 6.4
ammonia: not tested
nitrite: 0
nitrate: 250 !
kH: 3
gH: 8
tank temp: 24
Fish Symptoms (include full description including lesion, color, location, fish behavior): see pic, fins white and eroded, also stuck together
Volume and Frequency of water changes: monthly 25% water change
Chemical Additives or Media in your tank: water cycle
Tank inhabitants: 2 silver dollars, 2 clown loach, 1 clown plec, 1 severum, 2 catfish, 5 neon tetras, 1 rainbow fish 5 algae eaters, 2 platys and 2 burmese loaches
Recent additions to your tank (living or decoration): 3 chinese leaf plants and small bog wood
Exposure to chemicals: n/a
Digital photo (include if possible): pic included in post
do you have a new or established tank, how long have you had the fighter, what are your water parameters. I had a fighter that had a similar thing. It was down to bad water parameters as the tanked hadn't cycled and stress. He managed to survive and all his fins and tail have grown back and he looks very happy and healthy now.
To correct my problem I did a 50% water change and then 20% daily for a couple of weeks. This allowed my tank to stabilise and within those couple of weeks my fighter started eating again and his fins and tail had grown back. I also treated the water with API stress coat.
what tank mates has he got
Your tanks overstocked and your water stats are telling you that.
Your nitrate reading really high.
How often do you maintain the tank.
When did youn last squeeze a sponge in old tank water.
Finrot is mainly caused by bad water quality.
Maes betta are best of kept in a tank of there own.
How big is the spare tank in gallons. Do you have a heater and airstone.
Myxazin by waterlife for finrot.
i think you should rehome: the severum, the clown loaches, the silver dollars, and some of the algae eaters.
Just get one of your filter sponges and rinse in old tank water.
To the rest of the sponges in a few weeks time.
Should only rinse one sponge and leave the rest for a least two weeks.
Do a gravel vac removing ornaments.
Water changes to get the nitrate reading down.
You should be doing a water change once a week with your tank being overstocked.
i think you should rehome: the severum, the clown loaches, the silver dollars, and some of the algae eaters.
Clown loaches need 90 gallon tanks as they grow bigger. Shouldn't be kept in less than a group of 3.
Move the betta and match ph and temp.
Severums grow to 20cm, and as wilder said clown loaches need very big tanks.
I said get rid of some of the algae eaters as you seem to have quite alot of bottom dwellers.
I would do a 40% to 50% water change.
Rinse the sponge in old tank water, not tap water.
I think clown loaches are slow growers. But the tanks is to small.