Starting your first tank? Whether it’s for shrimp, plants, or nano fish, getting things right from the beginning will save you money, stress, and livestock losses. This step-by-step checklist walks you through the entire setup process — from gear to water chemistry to first livestock.
1. Choose Your Tank Size & Placement
- Recommended: 10–20 gallons for stability
- Place away from direct sun, near outlets
- Use a level stand or surface (test with water first)
2. Add Substrate, Hardscape, and Plants
- Choose active substrate for shrimp, inert sand/gravel for fish
- Add hardscape (rock/wood), then mist lightly
- Optional: Add beginner-friendly plants (Java fern, moss, Crypts)
3. Fill With RO or Dechlorinated Water
- Use RO + GH+ remineralizer for shrimp
- Use dechlorinated tap for fish or Neocaridina
- Fill slowly to avoid disturbing layout
4. Install Filter, Heater & Lighting
- Sponge filter or HOB for small tanks
- Set heater to 72–75°F for shrimp, 75–78°F for tropical fish
- Use a timer for your light — start with 6 hours/day
5. Begin Cycling the Tank
- Add ammonia or shrimp-safe fish food
- Add a bacteria starter (Fritz, Dr. Tim’s)
- Test for ammonia, nitrite, and nitrate every 3–4 days
- Cycle is done when ammonia + nitrite = 0 and nitrates are present
6. Test Water Parameters
- Target GH: 4–6 for Caridina, 6–8 for Neos
- TDS: 100–150 Caridina, 150–250 Neocaridina
- pH: 6.0–6.8 for Caridina, 6.8–7.4 for Neos/Fish
7. Add Livestock (Slowly!)
- Start with a cleanup crew or hardy shrimp
- Acclimate slowly using drip method
- Wait 1–2 weeks before adding more
Related Setup Tools
Need help choosing gear or water parameters? Drop your tank size and goals in the comments and I’ll build you a custom checklist.
Startup checks before the first fish
A new tank is ready when the system is stable, not when the water looks clear. Use the startup checklist to confirm the invisible pieces are working.
- The filter has been running long enough to support beneficial bacteria.
- Ammonia and nitrite are both reading 0 ppm before livestock is added.
- The heater holds a steady temperature for several days.
- The water is dechlorinated every time new tap water enters the tank.
- Stocking starts light so the filter can adjust to the new bioload.
Rushing the first week is the easiest way to create the first emergency. Slow setup makes the tank easier from day one.
The first week after adding fish
The first week with livestock is when a new aquarium tells you whether the setup was truly ready. Test ammonia and nitrite frequently, feed lightly, and watch behavior more than appearance. Fish hiding constantly, gasping, clamping fins, or refusing food are early clues that the tank needs attention before it becomes a full rescue situation.
Add fish in stages instead of filling the stocking plan all at once. Even a cycled filter needs time to adjust to a larger bioload. A small first group lets bacteria catch up, gives you time to spot compatibility problems, and keeps water changes manageable if something goes wrong.
Avoid deep cleaning during this period. Do not replace all filter media, scrub every surface, or vacuum the entire substrate unless there is a clear reason. The tank is building stability. Your job is to keep water safe, feed modestly, and let the filter and bacteria settle into the new workload.
Quick answer: A new aquarium is ready for fish when ammonia and nitrite stay at 0 ppm, temperature is stable, and the filter has enough bacteria to handle a small first stocking.
Frequently asked questions
How long should a new aquarium run before fish?
It depends on the cycle, not the calendar. Add fish only after ammonia and nitrite can stay at 0 ppm and the tank is stable.
Should I add all my fish at once?
No. Add a small first group, test often, and let the filter adjust before adding more livestock.
What is the biggest new-tank mistake?
Adding too many fish before the cycle is ready. That creates ammonia and nitrite spikes that can quickly become emergencies.
Final startup reminder
Before you call a startup complete, look for boring consistency. The filter should run quietly, temperature should hold steady overnight, and test results should repeat instead of surprising you. That boring pattern is what keeps the first fish safe. If anything still feels uncertain, wait, test again, and add livestock more slowly. A patient first month is easier than trying to rescue a tank that was stocked before the bacteria, equipment, and routine were ready.
Author and editorial note
Written and maintained by Benjamin Thoden, founder of DBC Aquatics. This shrimp guide is reviewed through DBC Aquatics’ stability-first lens: cycle maturity, mineral consistency, molt safety, copper risk, grazing surfaces, and slow acclimation matter more than quick fixes. See our editorial standards for how guides are created, reviewed, and updated.
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