{"id":1516,"date":"2020-02-04T12:04:46","date_gmt":"2020-02-04T12:04:46","guid":{"rendered":"https:\/\/www.petz.co.uk\/?page_id=1516"},"modified":"2026-03-12T10:48:01","modified_gmt":"2026-03-12T10:48:01","slug":"best-fish-tank","status":"publish","type":"page","link":"https:\/\/www.petz.uk\/best-fish-tank\/","title":{"rendered":"Best Fish Tanks UK 2026: Beginner, Tropical & Nano Aquariums \u2014 Setup Guide & Top Picks"},"content":{"rendered":"

Whether you’re starting your first aquarium or upgrading to a bigger setup, choosing the right fish tank<\/strong> makes all the difference. We’ve compared the best UK options for 2026 across beginner, tropical, and nano categories — plus a complete setup guide so you get it right from day one.<\/p>\n

Best Fish Tanks Compared<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Model<\/th>\nType<\/th>\nCapacity<\/th>\nFilter<\/th>\nHeater<\/th>\nPrice<\/th>\n<\/tr>\n<\/thead>\n
Juwel Primo 70<\/strong><\/td>\nBeginner<\/td>\n70L<\/td>\n\u2705 Internal<\/td>\n\u274c Sold separately<\/td>\n£70–£100<\/td>\n<\/tr>\n
Fluval Roma 125<\/strong><\/td>\nTropical<\/td>\n125L<\/td>\n\u2705 3-stage<\/td>\n\u2705 Included<\/td>\n£200–£280<\/td>\n<\/tr>\n
Fluval Shaker 252<\/strong><\/td>\nPremium tropical<\/td>\n252L<\/td>\n\u2705 External<\/td>\n\u2705 Included<\/td>\n£500–£700<\/td>\n<\/tr>\n
Tetra Starter Line 54L<\/strong><\/td>\nBeginner<\/td>\n54L<\/td>\n\u2705 Internal<\/td>\n\u2705 Included<\/td>\n£60–£85<\/td>\n<\/tr>\n
Marina 360 Aquarium<\/strong><\/td>\nNano<\/td>\n10L<\/td>\n\u2705 Internal<\/td>\n\u274c<\/td>\n£30–£50<\/td>\n<\/tr>\n
Fluval Edge 2.0<\/strong><\/td>\nNano<\/td>\n23L<\/td>\n\u2705 Hidden<\/td>\n\u274c<\/td>\n£100–£140<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Fish Tank Size Guide<\/h2>\n

Bigger is always better in fishkeeping — larger water volumes are more stable and forgiving. The RSPCA recommends avoiding tanks under 40 litres<\/strong> for beginners, as small volumes change chemistry rapidly.<\/p>\n\n\n\n\n\n\n\n\n
Tank Size<\/th>\nBest For<\/th>\nFish Capacity (approx.)<\/th>\n<\/tr>\n<\/thead>\n
20–40L (nano)<\/strong><\/td>\nBetta, shrimp, snails, experienced only<\/td>\n1 betta or 6–8 shrimp<\/td>\n<\/tr>\n
54–70L (starter)<\/strong><\/td>\nBeginners, small community fish<\/td>\n8–12 small fish (neons, guppies)<\/td>\n<\/tr>\n
100–150L (standard)<\/strong><\/td>\nCommunity tank, pairs, planted<\/td>\n15–25 small fish or 6–8 medium<\/td>\n<\/tr>\n
200L+ (large)<\/strong><\/td>\nCichlids, angels, larger species<\/td>\nVaries by species<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Stocking rule:<\/strong> Allow 1.5–2 litres per 1 cm of adult fish length (not including tail). Always research the adult size<\/strong> of your chosen species before buying.<\/p>\n

Tropical vs Coldwater: Which Setup?<\/h2>\n\n\n\n\n\n\n\n\n\n
Feature<\/th>\nTropical<\/th>\nColdwater<\/th>\n<\/tr>\n<\/thead>\n
Heater needed?<\/strong><\/td>\n\u2705 Yes (22–28°C)<\/td>\n\u274c No (room temp OK)<\/td>\n<\/tr>\n
Species variety<\/strong><\/td>\nHuge (neons, guppies, angels, corydoras)<\/td>\nLimited (goldfish, WCMM, weather loach)<\/td>\n<\/tr>\n
Tank size<\/strong><\/td>\n54L+ for beginners<\/td>\nBigger is better — goldfish grow large<\/td>\n<\/tr>\n
Running cost<\/strong><\/td>\nSlightly higher (heater £3–£5\/month)<\/td>\nLower<\/td>\n<\/tr>\n
Maintenance<\/strong><\/td>\nWeekly 20% water change<\/td>\nWeekly 20% water change<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Beginner Fish Tank Setup: Step by Step<\/h2>\n
    \n
  1. Position:<\/strong> Place on a sturdy, level surface away from direct sunlight, radiators, and draughts<\/li>\n
  2. Rinse substrate:<\/strong> Wash gravel or sand thoroughly until water runs clear<\/li>\n
  3. Add décor:<\/strong> Rocks, wood, and plants create hiding spots — soak wood first to prevent tannin leaching<\/li>\n
  4. Install filter & heater:<\/strong> Set up but don’t turn the heater on until the tank is full<\/li>\n
  5. Fill carefully:<\/strong> Pour water over a plate placed on the substrate to avoid disturbing it<\/li>\n
  6. Add water conditioner:<\/strong> Treats tap water to neutralise chlorine and heavy metals<\/li>\n
  7. Cycle the tank:<\/strong> Run the filter for 4–6 weeks<\/strong> before adding fish (fishless cycle) to build beneficial bacteria<\/li>\n
  8. Test water:<\/strong> Use an API test kit to confirm ammonia = 0, nitrite = 0, nitrate < 40 ppm<\/li>\n
  9. Add fish gradually:<\/strong> Introduce 2–3 fish at a time, waiting 1–2 weeks between additions<\/li>\n<\/ol>\n

    Essential Equipment Checklist<\/h2>\n\n\n\n\n\n\n\n\n\n\n
    Equipment<\/th>\nWhy You Need It<\/th>\nCost<\/th>\n<\/tr>\n<\/thead>\n
    Filter<\/strong><\/td>\nRemoves waste, houses beneficial bacteria<\/td>\n£15–£60<\/td>\n<\/tr>\n
    Heater<\/strong> (tropical only)<\/td>\nMaintains stable temperature (1 watt per litre)<\/td>\n£15–£30<\/td>\n<\/tr>\n
    Thermometer<\/strong><\/td>\nMonitors temperature — heaters can fail silently<\/td>\n£3–£8<\/td>\n<\/tr>\n
    Water conditioner<\/strong><\/td>\nNeutralises chlorine in tap water<\/td>\n£5–£10<\/td>\n<\/tr>\n
    Test kit<\/strong><\/td>\nMeasures ammonia, nitrite, nitrate, pH<\/td>\n£15–£25<\/td>\n<\/tr>\n
    LED light<\/strong><\/td>\nSupports live plants and viewing<\/td>\n£10–£40<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Related Reading<\/h2>\n