Effective water volume
Display size is not always actual water volume after rock, sand, sump level, and equipment displacement.
PodDrop live-culture sizing lab
Right-size the culture. Start with the system.
Turn tank volume, livestock pressure, protected habitat, and your goal into a practical starting range for live copepods or phytoplankton.
Species-aware guidance
Built around system context
Product directions remain controlling
Start with the system
Tank volume matters. It is not the whole answer.
Two reefs with the same water volume can require different starting plans. Predation, protected habitat, system maturity, the target livestock, culture density, and the product itself change the decision.
Use the calculator to establish a practical range, then confirm the current product page before ordering.
Interactive sizing lab
Build your starting plan
Choose the pathway that matches what you are adding. Your result updates instantly and points to the most relevant PodDrop collection.
01
Culture pathwayWhat are you sizing?
02
System volumeApproximate actual water volume
03
Objective & contextWhy are you adding the culture?
Concentration matters. Different strains and blends can require different rates. The calculator provides an aquarium starting range; the product label overrides it.
Enter a system volume from 5 to 5,000 gallons.
Four inputs behind the number
A better recommendation sees more than gallons
The calculator gives a disciplined starting point. These factors explain why the same volume can lead to a different plan.
Habitat & refuge
Rockwork, sand, media, and refugia can create protected surfaces where parts of a population can establish.
Species & density
Bottle volume alone does not make species interchangeable. Product identity, density, and life-stage profile matter.
Demand & observation
Predators, filter feeders, nutrient conditions, and culture response determine whether and when to adjust.
Choose the right product path
The amount is only useful when the culture fits the job
Defined organismSingle-species copepodsChoose when habitat, prey profile, organism identity, or culture control matters.Compare species
Living nutritionLive phytoplanktonSelect around the target organism, strain, concentration, feeding routine, and culture objective.Choose phytoplankton
Matched workflowBundles & starter systemsUse when a grouped pod-and-phyto or culture workflow reduces decision friction.Browse starter systems
From estimate to execution
A measured four-step introduction
Buying enough culture helps, but receiving, placement, and observation determine whether the starting plan is used responsibly.
- 01
Receive promptly
Track the shipment, limit outdoor exposure, inspect the culture, and follow the current label.
- 02
Introduce deliberately
Use species- or product-specific guidance rather than one universal acclimation or dosing method.
- 03
Protect the opportunity
For copepods, use appropriate timing and habitat. For phyto, manage filtration and nutrient response.
- 04
Observe before repeating
Reassess livestock pressure, visibility, water quality, and the current product directions before adjusting.
Sizing questions
Before you treat the estimate like a prescription
These answers clarify what the calculator can and cannot determine.
Open the complete FAQIs more culture always better?
No. A larger starting amount can improve distribution and encounter probability, but species fit, habitat, predation, water quality, and handling still control the outcome. More volume is not a substitute for a suitable plan.
Should I use display-tank size or total system volume?
Use approximate actual system water volume when possible. If your sump or refugium meaningfully increases water volume, include it, then account separately for the protected habitat it provides.
Why does the calculator round copepods to 8 fl oz increments?
PodDrop culture formats are commonly offered in practical bottle increments. The rounded result is an ordering range, not an organism count or laboratory concentration claim.
Can I use one phytoplankton rate for every product?
No. Strain, blend composition, cell density, intended organism, nutrient conditions, and storage age can affect use. Start conservatively and follow the current product page and label.
What if my reef is larger than 250 gallons?
The tool will still calculate a range, but large displays and professional systems benefit from a direct review of livestock, receiving, cadence, and available culture formats before ordering.
Need a human review?
Bring the system details. We’ll help refine the path.
Include the tank or culture volume, system age, livestock or target organism, refugium, filtration, current routine, and the outcome you are trying to support.