Flashing - infection? parasite?

Angel's, Discus, Oscars, Rams, Malawi etc.
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a1154
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Hi, after adding some fish from a new LFS to my Malawi tank, I saw many fish flashing and scratching on rocks. There is nothing external to see at all. I treated the whole tank with api melafix for 7 days then did some water changes. The flashing continued, so after a couple of weeks I tried this again. They are still flashing.
There aren’t any other symptoms. What do you think? Leave them alone or treat with something else?
TIA.
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black ghost
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Probably flukes, especially if it transferred very quickly. Worms would take longer. I’d treat (both) with Sterazin.
I don't keep fish, I keep water. Water keeps fish.
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a1154
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I have ordered some. Thank you.
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black ghost
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Is the ammonia zero?
I don't keep fish, I keep water. Water keeps fish.
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a1154
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I’ll check.
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a1154
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Yes it is.
Treatment has arrived and it’s 10 days long so I’m going to clean the filters, do a big water change then use it today.
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fr499y
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dont clean the filters, treatment can kill some bacteria so best to leave it as it is until after the 10 days :) Water change is a good idea though.
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a1154
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OK will do.

Yikes! Looks like night nurse!
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black ghost
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You can do a water change on any day that you’re not dosing. Sterazin won’t affect filter bacteria.
I don't keep fish, I keep water. Water keeps fish.
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a1154
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Ack! I have finished the treatment and while doing a water change and I can see parasites on the glass where the water has dropped! I have good short sight vision. They are small and orange ish. I have tried a photo but the camera can’t focus on them.
Help! Does this mean it’s something else not killed by the sterazin, or should I carry on dosing?
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