Reef Octopus Regal 300INT 12in Internal Protein Skimmer (VarioS) fit check
Reef Octopus Regal 300INT 12in Internal Protein Skimmer (VarioS) is an in-sump internal with controller protein skimmer rated up to 500 gallons. Box ratings assume light stocking, so ReefCrafter scales them by bioload: about 335 gallons lightly stocked, 250 gallons medium, or 200 gallons for a heavily fed fish tank.
Reef Octopus Regal 300INT 12in Internal Protein Skimmer (VarioS): fits roughly 200-500 gallon systems. Specs, compatibility math, sizing risks, and…
Who it is for
Good fit for
- ✓ 200-500 gallon systems, per the catalog fit range.
- ✓ Heavily fed tanks up to about 200 gallons, or lightly stocked tanks up to about 335 gallons.
Not a fit for
- ✕ Tanks under about 200 gallons; it is sized above them.
- ✕ Systems over about 500 gallons without adding capacity elsewhere.
- ✕ Heavy-bioload tanks above about 200 gallons; the box rating assumes light stocking.
- ✕ Hang-on-back or AIO setups without a sump chamber deep enough for it.
Listed features
- 12 in body
- in-sump
- controllable VarioS DC pump
- needle wheel
Compatibility math
Bioload headroom
Example: On a 75g mixed reef, ReefCrafter wants about 150g of skimmer rating for medium bioload.
Reef Octopus Regal 300INT 12in Internal Protein Skimmer (VarioS) is rated around 500g, so the useful question is whether that clears the fish load with margin.
Risk notes
- A skimmer can be fine for a light reef and thin for the same tank once feeding and fish load increase.
Professional fit context
- Compare rated maximum gallons, physical fit, cup clearance, noise, and bioload margin.
- Reef Octopus Regal 300INT 12in Internal Protein Skimmer (VarioS) fits roughly 200-500 gallon systems; confirm that range against the final display volume, sump volume, and livestock plan.
Alternatives to compare
- Nyos Quantum 220 Protein Skimmer
Same 500 gallon rating; compare format and features instead.
- Royal Exclusiv Bubble King Supermarin 200 Internal Protein Skimmer
Same 500 gallon rating; compare format and features instead.
- Royal Exclusiv Bubble King Double Cone 250 Protein Skimmer
400 gallon rating vs 500: less headroom, for smaller or lighter-stocked tanks.
Livestock this affects
- Powder blue tang
Bioload score 3.4; size the skimmer for heavy feeding.
- Foxface rabbitfish
Bioload score 3.2; size the skimmer for heavy feeding.
- Purple tang
Bioload score 3; size the skimmer for heavy feeding.
- Yellow tang
Bioload score 3; size the skimmer for heavy feeding.
Full spec snapshot
- Category
- Skimmers
- Build tier
- Premium
- Estimated price
- $1,000
- Tank fit range
- fits roughly 200-500 gallon systems
- Format
- In Sump Internal With Controller
- Rated skimmer capacity
- 500 gal
Related reading
Questions
Is the Reef Octopus Regal 300INT 12in Internal Protein Skimmer (VarioS) big enough for my tank?
It is rated up to 500 gallons. ReefCrafter wants 1.5x, 2x, or 2.5x the display volume in skimmer rating by bioload, so it fits about 335 gallons lightly stocked, 250 medium, or 200 heavily fed.
What tank size is the Reef Octopus Regal 300INT 12in Internal Protein Skimmer (VarioS) for?
ReefCrafter's catalog fit range for it is 200-500 gallon systems. Confirm that against your final display volume, sump volume, and livestock plan rather than the box label alone.
What should I compare the Reef Octopus Regal 300INT 12in Internal Protein Skimmer (VarioS) against?
Nyos Quantum 220 Protein Skimmer (Same 500 gallon rating; compare format and features instead); Royal Exclusiv Bubble King Supermarin 200 Internal Protein Skimmer (Same 500 gallon rating; compare format and features instead); Royal Exclusiv Bubble King Double Cone 250 Protein Skimmer (400 gallon rating vs 500: less headroom, for smaller or lighter-stocked tanks).
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