Algae Fix is a poison and is hard on fish and plants. I would do an additional pwc soon to get that stuff out as much as possible.
Edit: It is used for algae killing but it is often reported by users as being used at a time when fish become sick and plants become sick. What I mean is that it is supposed to be safe for use, but it does seem to effect fish and even plants in a stressed system often.
Reading the safety data sheet discusses how it can irritate skin, and eyes with prolonged contact.
When things like this are used it can tilt a precarious tank situation over the edge.
As it seems you have additional problems with the fish.
The previous fish you added could have brought in Columnaris infection?
Edit: It is used for algae killing but it is often reported by users as being used at a time when fish become sick and plants become sick. What I mean is that it is supposed to be safe for use, but it does seem to effect fish and even plants in a stressed system often.
Reading the safety data sheet discusses how it can irritate skin, and eyes with prolonged contact.
When things like this are used it can tilt a precarious tank situation over the edge.
As it seems you have additional problems with the fish.
The previous fish you added could have brought in Columnaris infection?
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