Hey I've got a problem which I'm not sure you guys have encountered...
I've got about 100 cardinals in my tank, of which maybe 5-6 are making this strange flicking motion... they swim and eat normally, but then they just do this occasional twitch... in addition, one of them is doing it more violently, and it seems to always swim with its head tilted downwards in a 20 degree incline...
I'm planning to increase the salt levels in the tank... but before I do so, do any of you have any guesses as to what it is? and better still, how to treat?
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