5 Gallon Planted Aquarium Setup Guide: Nano Scape

This 5 gallon planted aquarium setup guide is written from the bench at Gensou Aquascaping, 5 Everton Park, Singapore, where we rescape nano tanks weekly for HDB owners who want a planted jewel without dedicating half a living room to it. A 5 gallon (roughly 19 L) footprint is the sweet spot where you can actually carpet, pressurise CO2, and keep shrimp, without the high-tech cost of a 60 P. Expect to spend SGD 280-450 building it properly, and around SGD 25-35 per month on fertiliser, RO top-ups and the occasional replacement light diffuser.

Why 19 L Is the Smallest Sensible Planted Footprint

Below 19 L, parameter swings from Singapore’s 28-30°C ambient heat become brutal: 2°C in an afternoon, TDS climbing as water evaporates overnight with the aircon off. At 19 L you still swing, but CO2 distribution, light penetration and maintenance intervals are forgiving. A typical tank is 30 x 25 x 25 cm or the ADA Mini S (36 x 22 x 26 cm, 20 L) — both give you enough vertical column to stage a foreground, midground and a single Bucephalandra-draped hardscape point.

Tank Choice: Rimless Low Iron vs Budget Curved Glass

Rimless low-iron cubes from Chihiros, UNS or the ADA Mini line run SGD 65-160. Curved-glass Chinese imports go for SGD 25-40 on Shopee. The low-iron glass is not vanity — green tint on standard float glass shifts your reds (Rotala Rotundifolia “H’ra”, Ludwigia sp. “Mini Super Red”) towards muddy orange under 6500 K LEDs. If you plan to photograph the tank, pay for clarity.

Substrate: Active Soil Is Non-Negotiable

Use an active aquasoil — ADA Amazonia V2, Tropica Aquarium Soil, or the cheaper Oliver Knott Nature Soil. A 3 L bag is enough for a 1.5 inch front slope rising to 3 inches at the back. Inert gravel over root tabs works, but in 19 L you will fight algae during the first three weeks regardless. Soil buys you NH4 absorption and a kH/gH drop that rasboras and Neocaridina appreciate. See our aquasoil vs inert substrate comparison for the numbers.

Lighting: 18-25 W Is Plenty

A Chihiros WRGB II Mini (25 W, SGD 195) or Week Aqua P200 (20 W, SGD 130) is overkill on paper and perfect in practice. Start at 40% intensity, 6 hour photoperiod, and ramp to 60% over month two. Anything stronger on 19 L in Singapore’s ambient heat is an algae farm. PAR at substrate should land 60-90 µmol for a carpet of Monte Carlo or Eleocharis sp. “Mini”.

CO2: Pressurised Beats DIY in This Climate

DIY yeast drops pH unpredictably and gasses off within 10 days in 29°C water. Get a 0.5 kg disposable or refillable CO2 cylinder (SGD 45 refill at Polyart), a solenoid regulator, and a glass diffuser. Aim for 1 bubble per second, 2 hours before lights on. A drop checker should read lime green. Our pressurised CO2 setup for nano tanks walks through the fittings.

Filtration and Flow

An Oase Biomaster 250 is overkill; a small canister like the Eheim Classic 2211 (300 L/h, SGD 110) or an Oase FiltoSmart 60 suits 19 L. Hang-on-backs work but evaporate CO2. Spray bars or lily pipes give laminar flow that distributes CO2 evenly — critical in a planted nano.

Water: PUB Tap, Remineralised

PUB tap in Singapore runs kH 1-2, gH 2-3, TDS 80-110 — surprisingly soft. For shrimp safety and plant stability, pass it through a simple inline carbon block to strip chloramine, then remineralise to gH 6, kH 2 using Salty Shrimp GH/KH+. Never dose straight dechlor and hope; chloramine breaks to ammonia and your cycle will stall.

Heater, or No Heater?

If your flat runs aircon nightly below 25°C, a 25 W heater set to 24°C stabilises things. If you run fans-only, ambient 28-30°C is already on the warm edge for rasboras and shrimp — skip the heater and consider a small USB cooling fan across the surface to drop 1-2°C via evaporation.

Planting and the First 30 Days

Plant dense on day one: 6 pots minimum. Stems at the back, epiphytes on wood, carpet in the front. Dry-start Monte Carlo for 3 weeks if you have patience. Run a fishless cycling routine for 2-3 weeks before adding livestock. Expect diatoms by day 10 and green dust algae by day 20 — both pass.

Stocking a 19 L Planted

8-10 chili rasboras (Boraras brigittae) or 6 ember tetras (Hyphessobrycon amandae), plus 10-20 Neocaridina davidi. Skip otocinclus — they starve in nano tanks. See our chili rasbora care guide for acclimation.

Singapore Sourcing Summary

C328 Clementi carries Chihiros lights and Tropica 1-2-Grow tissue cups (SGD 14-18). Y618 Aquatic Serangoon North stocks ADA Amazonia (SGD 38 per 3 L) and UNS rimless tanks. Green Chapter Jurong West has the best pressurised CO2 regulator selection (SGD 180-260). Iwarna Aquafarm is where you grab Boraras and Neocaridina at fair weekend prices. Nature Aquarium Gallery on Thomson Road handles full ADA Mini S setups and hardscape stones (SGD 12-20 per kg seiryu). Polyart does CO2 refills at SGD 45 per 0.5 kg. Carousell and Shopee cover budget canisters, lily pipes and Salty Shrimp remineralisers — check seller reviews before buying glassware.

Related Reading

• Nano Aquarium Setup Guide
• Monte Carlo Carpet Dry Start Method
• Neocaridina Shrimp Care in Singapore
• Algae Control for Planted Nano Tanks
• ADA Mini S Iwagumi Build Walkthrough