Infected Tank?

[capoeira]

Hello

I have had the tank for about 3 weeks with no problems until recently. I had bough home a male angelfish from a local fish store different to where I had bought the others. When I first placed it in the tank it did not seem to want to eat though thought nothing of it since it was new to the tank.

After 2 more days I saw it was eating but very little and its ventral fins seemed to be a bit clamped at times. Next thing I notice after a day is that one if its pectoral fins have decayed a bit so I removed it. All the rest of the fish seem fine but I am worried about the other angel fish (it’s a young gold marble) its eating normally and its fins aren’t clamped but its swimming up and down a bit faster than normal. Should I just wait and see what happens or get some kind of medication for the sick fish and the others just to make sure.

Also I went back to this shop and saw that the tank I bought the fish from had a angelfish floating round alive but upside down. I bought a fish from them months ago which acted the same way and slowly all the fish ended up with the same strange problem - at the time no shop could help me so i disposed of the fish (keep in mind i live in the UAE and there are no shops that know anything here).

my set up is (sorry it maybe a bit Vague)

Two polka dot loaches
1 Gold female Marble Angelfish
1 gold male Angelfish (quarantined)
Sucker fish
Some other fish

700l Power filter
Heater set at 26C
Ultraviolet light
2 live plants
Chlorine, ammonia and PH all seem fine

Help please?
:bowing:

 

[OrionGirl]

Without a specific ailment, medications will not be useful, and may cause secondary problems if they impact the biological filtrations. For now, monitoring the fish, and treating if you can diagnose a specific ailment. Keep up the water changes--healthy fish are less likely to get sick if exposed, and more likely to recover if ailing.