Are you keeping the top on?
The key to keep these little guys healthy is abundance of floaters/emergent plants. They have ready access to atmospheric co2 and, therefore, are only limited by the available light and water column nutrients.
They should not require frequent water changes, only periodic top-offs, that keeps the co2 fluctuations in the water to a minimum.
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Courtesy * Integrity * Perseverance * Indominable Spirit * and Self Control
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