What Should I Do When Ammonia Shows Up in My Shrimp Tank?

Seeing the ammonia test turn a different colour than usual is unsettling, especially if you’ve already noticed the shrimp acting differently. Start with the tank in front of you. Check that the filter is running, stop adding food for now, and remove obvious waste you can reach. Repeat an unexpected test with a clean vial, but if several shrimp are struggling, treat that as urgent while you check the result.

Check the reading and record it

Read the directions for your kit. Check the expiry date, use the right water volume and number of drops, and wait for the stated time before comparing the colour in good light. A dirty vial, an old reagent or reading the chart too late can give you a misleading result. Use a fresh tank sample for the repeat test. Write down the result, the unit and the time.

Many aquarium kits report total ammonia, which includes ammonia and ammonium. The proportion present as the more toxic un-ionised ammonia depends in part on pH and temperature. That’s a reason to record those readings, too. It isn’t a reason to change the pH abruptly. In an established freshwater shrimp tank, the practical expectation is an undetectable ammonia result. The cherry shrimp water parameters guide explains the main tests and how they fit together.

Take a quick look at the equipment

Is the water moving at the filter outlet? If you have a sponge filter, can you see the expected flow and bubbles? Check whether something was unplugged after maintenance, whether the intake is blocked, or whether a recent power cut interrupted it. If flow has dropped, deal with the obstruction carefully and follow the manufacturer’s directions. Keep established biological media wet in aquarium water while you work.

Avoid replacing all the media to give the tank a fresh start. Established surfaces in the filter support the microbes that process waste. If the media needs cleaning, clear what’s preventing flow using a gentle rinse in removed aquarium water. If the filter sat stopped for an extended period or smells unusual, seek advice about how to bring it back into service safely and what to monitor afterwards.

Remove what you can see decaying

Look at the feeding dish, around the wood and near the intake. Remove uneaten food, a dead animal if you can confirm one, or an obvious mass of decaying plant matter. A narrow siphon or aquarium pipette lets you target a patch without pulling up the entire bottom. Check for shrimplets while you work, and avoid churning through the substrate in an effort to clean everything at once.

If you’ve just fed, note what you offered and how much was left. Leave further prepared feeds until the reading and the cause have been dealt with. In a mature tank, shrimp have established surfaces to browse while you do those checks. Once the tank is stable, you can resume with an amount you can watch and clear.

Use suitable replacement water

A partial water change with properly prepared water can dilute ammonia. Use water suited to the shrimp and reasonably close to the aquarium’s temperature and usual chemistry. Treat tap water as directed for chlorine or chloramine. Avoid making a large, abrupt change with water whose temperature, hardness or pH you haven’t checked. If the reading is high, keeps returning or the animals are struggling, contact an aquarium specialist promptly with the readings and your water source. They can help you decide how to proceed with the tank you have.

Test the water you’re using for replacement if you can do so without delaying urgent care. If you get a reading there too, look at the test kit instructions and the treatment you use. Some combinations of source water, conditioner and kit can complicate interpretation. Keep a note of what was treated and when. The tap-water guide explains why knowing what comes out of your tap matters.

Look for the change that started it

Think back over the last few days. Was the tank newly set up? Did you add several animals, clean or replace filter media, change the substrate or leave more food than usual? Has the filter been off, or did you notice a dead snail or fish? You may find one plausible cause or several smaller changes close together. Write them down while you remember them.

If the aquarium is new, the filter may still be establishing. Clear-looking water doesn’t tell you whether the system is processing waste. Check nitrite as well as ammonia and avoid adding livestock while the tank is unsettled. If you need help deciding whether the aquarium is ready, the first shrimp tank checklist covers the preparations and checks to make.

Retest and look for a stable pattern

After you’ve removed waste or changed some water, retest as appropriate and keep checking while the cause is being addressed. One better reading is encouraging. You want to see that it stays down and that nitrite remains undetectable. Check the animals’ behaviour alongside the numbers. Look for the usual quiet grazing and normal movement around the tank.

Keep the notes somewhere easy to find. Write down the original reading, what you did and what the next tests showed. If ammonia returns after you thought you’d dealt with it, those notes help you decide whether waste is still being added, filtration is still recovering or the replacement water needs a closer look. If shrimp are distressed or readings persist, share the record with an aquarium specialist instead of relying on repeated guesses.

If someone else is helping, give them the readings and agree on who will do the next check. That keeps two people from changing the water or adding a treatment independently. Leave the test kit and your notes together so the follow-up result can be compared with the original.

The free Neocaridina Shrimp Handbook sample is a useful starting point for putting together a regular care routine. For today, focus on the immediate sequence. Check the result and the filter, remove obvious waste, use appropriate replacement water if needed, and keep testing until the tank is stable.