“Green water” is the hobby nickname for live phytoplankton—tiny algae cells that sit at the very bottom of the marine food web. If you’re searching for green water for sale, you’re usually trying to do one of three things: boost pod populations, feed filter feeders, or create a more natural “plankton background” in your reef without dumping in heavy foods.
What green water does in a reef tank
- Feeds microfauna: Copepods and other tiny grazers eat phyto, then become food for fish and corals.
- Supports filter feeders: Sponges, feather dusters, bivalves, and many corals benefit from fine suspended nutrition.
- Builds stability: A steady plankton routine can make the tank feel “less sterile,” especially in systems running strong export.
Simple dosing guide (don’t overthink it)
There isn’t one perfect dose for every aquarium, so use checkpoints instead of chasing a magic number.
- Start small: Dose lightly and see how quickly the water clears.
- Dose into flow: Add near a return or powerhead so it disperses instead of settling.
- Night dosing works well: Many pods and corals feed more actively after lights out.
Chart: dial in your green water dose
| What you observe | What it usually means | Adjustment |
|---|---|---|
| Water clears in 2–6 hours | Good consumption | Keep the routine consistent. |
| Water stays tinted 12–24+ hours | Too much phyto / low uptake | Reduce dose 25–50% or split into smaller doses. |
| Pods don’t increase over 2–4 weeks | Underfeeding pods or heavy predation | Increase dosing slightly and focus dosing in refugium. |
| Nitrate/phosphate trend upward | Input exceeds export | Lower dose and/or improve export (macroalgae, skimming, water changes). |
Storage tips (keep it effective)
- Refrigerate: Keep green water cold to preserve quality.
- Shake gently: Re-suspend cells before dosing.
- Skimmer timing: If you want more uptake by livestock, pause skimming briefly after dosing (optional).
Featured green water product
Phyto-Plasm™ Phyto Green — Live green water (phytoplankton) you can dose to support pods, filter feeders, and a more natural reef food web.
Second option (alternate plankton support)
AlgaGenPods™ Tisbe — A refugium-friendly copepod that pairs naturally with phytoplankton dosing.
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