Time to change the substrate in your shrimp tank?
Substrate is the foundation of a thriving shrimp aquarium. But nothing lasts forever — and if you know when it's time to change it, and how to do it correctly, you'll avoid unnecessary stress for both you and your shrimp.
How long does the substrate last?
As a rule of thumb, active substrate is expected to last one to two years. Exactly how long depends on the thickness of your layer, how heavily stocked the tank is, and what brand you use. A thicker layer of 5–6 cm has more buffering capacity and lasts longer than a thin layer of 2–3 cm. Water changes with soft water extend the substrate's lifespan. When the pH starts to creep up or ammonia spikes appear for no apparent reason, it's a clear sign that the substrate is depleted.
Method 1 — Cycle an empty tank and move the group
The gentlest option is to set up a new aquarium in parallel, add new substrate, and let it cycle completely. Once the tank is stable, fill it with saved water from the old aquarium and move the entire shrimp group at once. The shrimp avoid being exposed to an immature tank, and you get a clean start without unnecessary stress.
Method 2 — Catch the shrimp and save the water
Alternatively, you can catch all the shrimp and keep them in the old aquarium water while you empty the tank, add new substrate, and then refill with the saved water and put the shrimp back. You retain the established biology in the water. It is VERY important which substrate is used in this method. It must be a substrate that releases minimal nutrients; Ebi Gold Shrimp Soil works for this.
Method 3 - Top up gradually
A third option is to siphon out some old substrate during water changes and gradually add a small amount of new, fresh substrate. This sounds gentle — but the method places high demands on the new substrate not to release ammonia. The wrong product can cause an ammonia spike in your otherwise stable tank, which is directly harmful to the shrimp.
Choose the right substrate — it makes all the difference
Regardless of which method you choose, the brand of the substrate is crucial. A substrate that releases ammonia during startup can cause great damage, especially if the shrimp are already in the tank. We recommend Ebi Gold Shrimp Soil, which is specifically designed for shrimp aquariums and provides a stable, ammonia-free startup. It buffers pH effectively and works excellently for both Caridina and Neocaridina species — whether you are doing a complete change or topping up gradually.
