I have used Melafix in the past in a low-tech tank and had no problems. I used Melafix & Pimafix once more recently to "help" with some damage from fin nipping and lost a LOT of livestock. Both are in a landfill somewhere now.
Tommy
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Eheim Pimp #204.
58 gal planted Oceanic
Red Turquiose Discus, Japonica shrimp, assorted Blue Eyed Rainbows, Tetras, Hatchets, etc.
10 gal low tech planted Cherry shrimp tank
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