If you are experiencing bacterial activity in your aquarium， then try Midland Vet Services Midland Vet Services Aqua-Zole Fish Antibiotic. This solution exerts a bacterial action on gram-positive and some gram-negative bacteria. Designed for aquarium and ornamental fish only， Aqua-Zole is useful for the control of bacterial diseases in fish， including aeromonas and pseudomonas genera， and mysobacterial group (gill diseases， chondrococcus.). This antibiotic has a treatment duration between 5-10 days.