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Originally Posted by botie  yes mission it darts from one end to the other |
I've noticed that amongst normal swimming/activity when a fish gives a random dart through the water it might be the beginning stages of an external parasite. Don't get all worried though. Just keep an eye on it to see if it starts scratching etc. . Or, actual visual signs such as spots etc. . My idea could be totally off base though. Just an idea. Unless it's going through some random ritual.