Nualgi has a mixed record with green bubble algae. If you decide to use Nualgi, we recommend dosing beneficial bacteria alongside Nualgi and carefully removing the bubble algae as much as you can while continuing with good husbandry practices with regard to lighting, feeding and water changes. While there are many brands of beneficial bacteria, we have had success with dosing Microbelift Aquarium Balancer, at the recommended dose 5 mins after dosing 1/2 dose of Nualgi weekly dose ( 0.5ml per 30 gallons). Good luck!
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