Why is my canister filter emitting bursts of fine air bubbles on my aquarium?
FRESHWATER: It’s important to perform regular filter maintenance (media rinsing and replacement) to prevent media from compacting, which can result in air accumulation. Also make sure to verify the inlet rubber hose connector that attaches to the siphon tube, which does dry out over time and becomes hard and non-flexible, thus requiring periodic replacement.
SALTWATER: This is probably due to your filter taking in the fine air bubbles introduced to the aquarium by protein skimmers. Make sure to use an effective bubble trap at the skimmer output or within the sump to prevent this from happening.