03-17-2012, 02:11 PM
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Originally Posted by SarahCalgary
Hi Byron, Well yes, the black skirts do nip each other and chase each other around. I would like to get a few more (only have 3 right now) so they have more of a school but didn't want to go do so until the tank was 100% better. Do you think it could be ich? I've read a bit about that and I'm not sure...
There's your culprit--the Black Widow Tetra (aka Black Skirt Tetra). Check the profile; it mentions this is a species prone to fin nip, and the flowing fins of the diamond tetra are like a red flag to a bull in this case. I would remove the Black Skirts. [Sorry, I didn't twig on these before, don't know why but i was looking at the caudal fin and considered both photos the same, and the second was the Diamond; i see now the first photo is a Black skirt.]
In small groups (certainly under 6, maybe even 8 with this species) this aggression can be heightened. But given the nature of the Diamonds, I would not get more Black Skirts but remove them completely. This is not likiely to change, as once a fish becomes nippy it tends to remain so. Black Skirts are like Serpae Tetra that should not be combined with sedate fish or those with long fins.
At least this was an easy issue to resolve.