Flowerhorn have a super weak immune system when it comes to breeding. And many flowerhorn die from no apparent reason after breeding(mostly males). If they're tearing each other up, put the divider up. Unless you want a dead fish after breeding. I've had my fair share of it...multiple times.
so how long would i have to keep the divider up for?
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Until her tube fully drops. Then take the divider out and monitor them cautiously. Don't want to bug them too much. Fish will vary from one to another. Bugging them too much can result in egg eating.