Planted Tank First Month Week-by-Week Guide: Day 0 to Day 30
The first month of a planted tank looks chaotic from the outside — diatoms one week, melt the next, ammonia spikes mid-cycle — but it follows a remarkably predictable timeline. Knowing what is normal at day 14 versus what is genuinely wrong saves countless beginners from rescaping a tank that was on track all along. This planted tank first month walkthrough from Gensou Aquascaping at 5 Everton Park covers day 0 through day 30 in seven discrete phases, with parameter targets and intervention triggers for each.
Day 0: Flood Day
The substrate is laid, hardscape positioned, plants planted. Pour dechlorinated water onto a saucer or plate to prevent substrate disturbance. Fill to within 5cm of the rim, then run the filter and light. Set lights to 5-6 hours at 60 per cent intensity. Test ammonia immediately — aquasoil baseline reads 0.5-1 ppm and will climb. Add a bottled bacterial starter to seed the cycle. Photograph the scape from the front for a baseline.
Days 1-3: Settling Phase
Plants will lean and shift in the first 48 hours as they orient to flow and light. Expect cloudy water from substrate dust — this clears in 36-72 hours through the filter. A surface skimmer attachment helps remove the oily film. Do not feed anything because there is no livestock. Run the filter on full output to circulate the bacteria. Test ammonia daily — readings climb to 1-2 ppm by day three.
Days 4-7: First Water Change and Diatom Onset
Day four water change: 50 per cent. The aquasoil ammonia leach is at peak now. Diatom film — that brown dust on glass and slow leaves — appears around day five and is entirely normal. Resist scrubbing it off prematurely; a quick glass wipe before the water change is enough. Keep light at 5-6 hours. Add a couple of Amano shrimp at day six if ammonia reads under 0.5 ppm — they tolerate the cycle and work the diatom phase.
Days 8-14: Cycle Mid-Point
Ammonia drops as the bacterial colonies catch up but nitrite spikes — this is normal and necessary. Test daily through this phase. Do another 50 per cent water change at day ten. Plants may look stressed: melting leaves on Cryptocoryne (expected, leave them), curling leaves on stems (check parameters), or fresh new shoots on Anubias (excellent sign). The tank is finding its rhythm. Browse the aquascaping tools range for testing accessories.
Days 15-21: Cycle Completion and First Signs of Stability
Nitrite drops, nitrate begins to register, and ammonia stays at zero between water changes. The diatom film starts retreating from the most-lit areas. Light extends to 6-7 hours. Plants visibly grow now: stems push 1-2cm of new tip per week, Anubias rhizomes throw new leaves. Begin half-dose liquid fertiliser at day 18 if leaves show pinhole holes (potassium) or yellow-green tips (nitrogen). Add 4-6 otocinclus to manage residual diatoms.
Days 22-28: Stocking Window Opens
By day 22, ammonia and nitrite read zero in tests taken before water change. Nitrate sits in the 10-20 ppm band. Plants pearl visibly under bright light around midday — a sign of active photosynthesis. Add a small school of 6-8 ember tetras or chili rasboras. Skip the centrepiece fish for another fortnight. Continue weekly 40-50 per cent water changes. The decoration and substrate range stocks the catappa leaves and cones that ease soft-water tetras into the tank.
Days 29-30: Month-One Checkpoint
Photograph the tank from the same angle as day zero. Compare. Most beginners are stunned by how little visible change has occurred — the bulk of growth happens during weeks four through twelve. Test full parameters: ammonia 0, nitrite 0, nitrate 10-20, pH 6.5-7.0, GH 4-6, KH 2-3. If any reading is dramatically off, dose accordingly rather than rescaping.
What Should Worry You
Black brush algae on hardscape edges within 30 days indicates flow stagnation — reposition the lily pipe. Cyanobacteria — that blue-green slimy film — signals nitrate depletion or phosphate imbalance, easily fixed with a 50 per cent change and dosing reset. Hair algae in clumps means light is too long or too strong; cut the photoperiod by an hour and reduce intensity 20 per cent.
What Looks Bad But Is Normal
Cryptocoryne melt down to the rhizome is normal — they regrow within 4-6 weeks. Diatom dust through week three is normal. Slight yellowing on Anubias older leaves is normal as plants reallocate nutrients to new growth. Cloudy water for 24-48 hours after planting is normal. Recognising these patterns saves countless beginners from intervening and making things worse.
Setting Up Month Two
The end of month one transitions the tank from cycle mode to maintenance mode. Water changes drop to weekly 40 per cent. Light extends to 7-8 hours. Dosing settles into a weekly rhythm. The next milestone is week eight, when the first carpet runners appear and the back wall thickens. By that point the difficult phase is over and the rewarding part begins.
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Drop by Gensou Aquascaping — most walk-in questions get answered in under 10 minutes by someone who has set up hundreds of tanks.
5 Everton Park #01-34B, Singapore 080005 · Open daily 11am – 8pm
