How much clearance do you need to get to the back for maintenance? Can you put this against a wall?

ALthough you can put it up against the wall I have it in a corner which allows me access to check the chambers in the back. Using a flashlight I can look in and see what is going on for maintenance. The back 2nd and 3rd chambers have glass for checking.

What heater should i use on this tank ?

Whichever heater you get, it will fail. In a week? In a month? In a year? Doesn't matter - it'll fail. It'll either fail off, and freeze your fish, or fail on, and boil your fish. But before you hold your face in your fish tank in despair - there is a solution! Get two smaller heaters. Instead of 100W, get 2x 50W. If one fails off, the other works harder to stop the temperature dropping too far. If either fails on, it'll just make your water a bit balmier than usual. Better still, get 3x30W heaters ! :)

Does it have a protein skimmer? Is there a good alternative to a protein skimmer?

No it doesn't come with a protein skimmer. Since nano tanks have become very popular over the last few years there are lots of options for these tanks as far as skimmers, upgraded pumps, etc. Tunze makes a very good small skimmer for these style tanks. I don't remember the model number of the one I had on my last biocube. As far as an alternative to a skimmer. Lots of water changes. I don't really think there is an alternative.

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Coralife BioCube, Aquarium Kit, Nano Tank, Customizable LED Lighting, for Saltwater and Freshwater Environments, 16 Gallons

Coralife BioCube, Aquarium Kit, Nano Tank, Customizable LED Lighting, for Saltwater and Freshwater Environments, 16 Gallons

Product ID: 39701968

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Details

Brand
Coralife
Material
Glass
Tank Volume
16 Gallons
Special Feature
BioCube
Product Dimensions
21.75"L x x
Shape
Square

💧16 Gallons capacity

🔆Customizable tri-channel LED lighting

🔇Whisper-quiet submersible pump

Description

🌊 Dive into brilliance with Coralife BioCube – where style meets science!

SEAMLESS SERENITY - Ultra-quiet pump with dual intakes and adjustable return nozzle for optimal water flow
TAILORED LIGHT SHOW - Three independent LED channels with 24-hour timer for vibrant coral & plant growth
SLEEK MODERN DESIGN - Rounded edges and minimalist black glass tank fit perfectly in any stylish workspace or home
NATURAL RHYTHMS AUTOMATED - Sunrise/sunset and moonrise/moonset modes mimic real aquatic day-night cycles
ALL IN ONE AQUATIC MASTERPIECE - Compact filtration chamber built-in for effortless setup & maintenance

The Coralife BioCube 16 Gallon Aquarium Kit combines a sleek, modern glass tank with a built-in customizable filtration system and vibrant tri-channel LED lighting. Designed for both saltwater and freshwater environments, it features whisper-quiet operation, automated natural light cycles, and compatibility with all BioCube accessories, making it the ultimate all-in-one nano aquarium solution for professionals seeking effortless aquatic elegance.

Specifications

Item Dimensions L x W x H	16.75"L x 15"W x 17.5"H
Tank Volume	16 Gallons
Material Type	Glass
Style Name	16 Gallon BioCube
Color	Black
Item Shape	Square
Additional Features	LED Biocube Marine or Freshwater Aquarium Kit
Target Species	Fish

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