Small double-door glass terrarium with mesh top and cable routing holes

Rank #10 in Best Reptile Vivarium 2026: 10 Ranked, and the Tank Volume Fields That Don't Add Up

NEPTONION 20 x 12 x 14 in Double-Door Glass Terrarium

£99.99 4.3 from 287 Amazon ratings
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Price and rating as shown on Amazon when we collected them. Both change.

The NEPTONION Terr-PT is the tenth entry in this guide: a 20 x 12 x 14 inch glass terrarium with double front doors, a lock, a cable port and a waterproof deep base below the doors, listed at £99.99 with 4.3 out of 5 from 287 ratings. It is a terrestrial vivarium for small species, and the listing names sandfish skinks as an example of what it is built for.

Where most listings in this guide print a capacity figure that has nothing to do with the box, this one holds up. The name says 20 x 12 x 14 inches, the dimensions field says 50.8 x 30.5 x 35.6 cm, and those are the same three numbers. 20 x 12 x 14 inches is 3,360 cubic inches, or roughly 14.5 US gallons, and the Tank Volume field reads 14.6 gallons — the closest match in the guide. The contradiction sits somewhere else. The same page calls the product a 'Reptile Terrarium Starter Set (4 Items)' and lists a rattan strip, a gold thread leaf and a conch leaf under Included Components, while Number of Items reads 1 and the first bullet states 'Sold as an empty tank only; decor and accessories are not included'. The warranty figures disagree too: the bullet promises 18 months of 'golden service', the Product Warranty field reads 1. Every figure on this page comes from the Amazon listing, not from any testing of ours.

How those 287 ratings break down

An average hides its own shape. This is the spread behind the 4.3 stars.

5 star
66%
4 star
18%
3 star
7%
2 star
2%
1 star
7%

Specification

Exactly as published on the Amazon listing, field for field.

Price £99.99
Rating 4.3 out of 5, from 287 ratings
Item dimensions 50.8 x 30.5 x 35.6 cm (the 20 x 12 x 14 inches in the name)
Tank volume 14.6 gallons
Set name (as listed) Reptile Terrarium Starter Set (4 Items)
Included components (as listed) Rattan strip, Gold thread leaf, Conch leaf
Number of items (as listed) 1
Product warranty (as listed) 1, against the 18 months of 'golden service' in the first bullet

What buyers actually say

Quoted from customer reviews on Amazon

Verified purchase

“Crate is too small”

Nina
Verified purchase

“This was a perfect size for what I wanted . It fits perfectly into a cubed unit with strip lights . Looks great . And with the 2 doors opening at the front , it's makes it easy for cleaning and feeding x”

Honey

What it is up against

The rivals it was ranked against in Best Reptile Vivarium 2026: 10 Ranked, and the Tank Volume Fields That Don't Add Up.

Questions people ask

How big is the NEPTONION Terr-PT?

The item dimensions field gives 50.8 x 30.5 x 35.6 cm, which is the 20 x 12 x 14 inches stated in the product name.

Does the 14.6 gallon tank volume match the size in the name?

It does. 20 x 12 x 14 inches is 3,360 cubic inches, and 3,360 divided by 231 is about 14.5 US gallons, so the Tank Volume field agrees with the dimensions rather than contradicting them.

Is decor included with the NEPTONION Terr-PT?

The listing says both things. The Set Name reads 'Reptile Terrarium Starter Set (4 Items)' and Included Components lists a rattan strip, a gold thread leaf and a conch leaf, but the first bullet says 'Sold as an empty tank only; decor and accessories are not included', and Number of Items reads 1. The page does not resolve which is correct.

Does it arrive assembled?

The first bullet says no assembly is needed and the tank is ready out of the box once unpacked.

What reptiles is the NEPTONION Terr-PT intended for?

The product name describes it as a terrestrial vivarium for small desert reptiles such as sandfish skinks, and Vivarium Type is given as Terrarium with Pet Type listed as Reptile.

How long is the warranty on the NEPTONION Terr-PT?

Two different answers appear on the same page. The Product Warranty field reads 1, while the first bullet offers '18 months of golden service'.

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