I've recently moved the guppy fries (age 2 to 3 months) to a bigger tank. Soon I discovered all of the guppies' eyes have darkened. It's been more than a week now and nothing has changed. Except for the darkening of the eyes my guppies are all doing very well. Active and good appetite.

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Courage is the complement of fear.
A man who is fearless cannot be courageous.
(He is also a fool)