As a barleystraw minibale takes a month to fully activate we recommend adding the second now and leaving the first of the year in the pond for a month’s overlap. As the first has diminishing action in the water so the second barleystraw minibale is springing into action.
That way you are not without an active minibale in one of the warmest months of the year while you are waiting for the new minibale to take effect.
If you always add the first minibale in February and the second in July you will have a month of every year without but that will be January when the weather is usually coldest and green algae is unlikely. So that routine works well.