7 Best Nano Tanks Under $100 for Planted Aquascapes

A nano tank is how most of us catch the aquascaping bug. You see a beautiful planted cube on Instagram, realize it fits on your desk, and suddenly you are researching substrates and CO2 systems at 2 AM. The good news is that you do not need to spend a fortune on the tank itself — some of the best nano aquariums cost less than a nice dinner out. Here are seven that deliver real quality for under a hundred bucks.

What to Look For in a Nano Tank

Glass quality: Low-iron (ultra-clear) glass versus standard glass makes a dramatic visual difference. Standard glass has a greenish tint that becomes obvious on small tanks.
Rimless design: Rimless tanks look cleaner and allow more light to reach plants. Braced tanks are stronger but less aesthetically pleasing.
Dimensions: Wider and shallower is better for aquascaping — more footprint for layout, easier lighting penetration.
Silicone quality: Clean, thin silicone lines indicate better manufacturing. Sloppy silicone work hints at quality control issues.

Size matters: Tanks under 5 gallons are challenging for beginners — water parameters fluctuate rapidly in small volumes. A 5 to 10 gallon nano is the sweet spot: small enough for a desk, large enough for stable conditions.

The 7 Best Options

1. UNS 5S (5 Gallon) — $45

The Ultum Nature Systems 5S is the gold standard for budget nano aquascaping. Ultra-clear low-iron glass, precise 45-degree mitered edges, and minimal silicone. Dimensions (12x8x8 inches) give you a decent footprint for a small Iwagumi or nature layout. This tank looks like it costs twice its price.

Best nano tanks under 100 — practical guide overview — Best nano tanks under 100

2. Lifegard Aquatics 5 Gallon — $40

Another low-iron rimless option with excellent glass clarity. Slightly different dimensions than the UNS (also approximately 12x8x8). The silicone work is clean, and the price is hard to beat for low-iron glass.

3. Waterbox Clear Mini 10 — $80

At 10 gallons, this is the largest tank on this list and the best value per gallon. Low-iron glass on the front panel (standard on sides), clean rimless design, and enough volume for a proper planted tank with shrimp or a small fish community. The included leveling mat is a nice touch.

Budget hack: Standard glass tanks from petco or local fish stores cost 50 to 70 percent less than low-iron equivalents. If you are on a tight budget, a standard 10-gallon tank with a good light is better than a fancy low-iron 3-gallon with a cheap light. Put your money into lighting and substrate first.

4. Dennerle Scaper's Tank 10G — $70

German-engineered with the widest footprint in its class (19x10x10 inches). The extra width gives you real aquascaping room. Float glass (not low-iron) but the precision engineering and oversized dimensions make this a favorite for European-style planted tanks.

Best nano tanks under 100 — step-by-step visual example — Best nano tanks under 100

5. Aqueon Frameless Cube 6 Gallon — $35

The most affordable option here. Standard glass (not low-iron) in a true cube shape (11.5 inches per side). Not the clearest glass, but the cube proportions are excellent for Iwagumi or cube-style scapes, and the price leaves more budget for equipment that matters.

6. UNS 60U (16 Gallon) — $95

Pushing the upper end of the budget but delivering a 24x10x12 inch footprint that opens up serious layout possibilities. Low-iron glass, beautiful clarity, and enough volume for carpet plants, a diverse plant selection, and a proper fish community. If your budget stretches to $95, this tank gives you the most aquascaping potential.

7. Mr. Aqua 7.5 Gallon Long — $55

The unique 22x7x8 inch "bookshelf" proportions create a cinematic widescreen effect perfect for nature-style layouts. Low-iron glass with excellent clarity. The narrow depth makes maintenance easy — you can reach every corner. The elongated shape is unusual and visually striking.

Comparison Table

Tank	Volume	Glass	Price	Best For
UNS 5S	5 gal	Low-iron	$45	Desk aquascapes
Lifegard 5G	5 gal	Low-iron	$40	Budget clarity
Waterbox Clear Mini	10 gal	Low-iron front	$80	Best overall value
Dennerle Scaper	10 gal	Float	$70	Wide layouts
Aqueon Cube	6 gal	Standard	$35	Tightest budget
UNS 60U	16 gal	Low-iron	$95	Serious aquascaping
Mr. Aqua Long	7.5 gal	Low-iron	$55	Widescreen layouts

Do not forget the stand: Even a small nano tank full of water is heavy. A 10-gallon tank weighs about 85 pounds filled. Make sure whatever you put it on is rated for the weight and perfectly level. A wobbling bookshelf is not a tank stand.

What to Buy Besides the Tank

The tank is typically the cheapest part of a planted nano setup. Budget for these essentials:

Best nano tanks under 100 — helpful reference illustration — Best nano tanks under 100

Substrate: $15 to $30 (aquasoil for planted tanks)
Light: $30 to $100 (see our LED lighting guide)
Filter: $15 to $40 (sponge filter or small HOB)
Heater: $15 to $25 (adjustable, not preset)
Plants: $20 to $50 (tissue cultures are the best value)
Hardscape: $10 to $30 (stones or driftwood)

Total budget reality: A complete planted nano setup (tank, light, filter, heater, substrate, plants, hardscape) runs $150 to $300 depending on quality choices. The tank itself is typically 15 to 25 percent of the total investment.

Figure out exactly how much water your chosen tank holds with our tank size calculator — manufacturer-listed volumes often include displacement from substrate and hardscape that reduces actual water volume.