Ok I got two more nightfish that also got sick or injured.
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The small one appears to have abrasions on its side (probably ammonia burn, hence the water change done in response to this)
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The adult is the one that worries me. It started off with a fungus on its lower lip (probably after a wound from ramming into something in the tank), then the fungus disappeared but the wound got bigger and just this morning, I found that the whole lower jaw was split in the middle.
Edited by pseudechisbutleri, 24 March 2018 - 04:37 PM.