First, you must consider your existing tankmates (should you have any). Shrimp come in all shapes and sizes, but in general are on the smaller side (around an inch or two). This makes them tasty snacks for larger fish. If you have any large fish, like Oscars or other cichlids, you may want to avoid wasting your money. Also, certain fish eat shrimp in the wild and will quickly consume any you may buy for your aquarium. These shrimp eating fish include loaches, puffers, and some gouramis. Mixing shrimp with fish is also not always a good investment due to the fact that if you buy a type of shrimp that does breed easily, baby shrimp will most likely be quickly snapped up. Therefore, your population will not replenish itself and the larger shrimp will die of old age.
Second, the aquarium is filled with hazards for shrimp that don't exist in the wild, namely filter intakes. Most are shielded somewhat, and this does the job for most adult shrimp unless the filter is particularly strong. However, baby shrimp will be sucked into the filter and, depending upon what type of filter you have, either lead very boring lives stuck in a canister filter or be smashed to death in the impeller. To prevent this, you can either put a piece of stocking over the end of the intake and secure it with a rubber band or plastic tie; cut a hole in a sponge like the types you buy for filter media and stick this over the intake, or switch to air-driven sponge filters. The stocking and sponge options will quickly clog with debris and need to be taken out and cleaned every week or two, so they are quite intensive. The sponge on the other hand is guaranteed not to bubble anything to death, but it will disperse CO2 if you are using it in your aquarium, and they tend to be quite large and ugly (not to mention take up valuable space inside the aquarium).
Third, make sure the type of shrimp you want matches your aquarium. Neocaridina japonica, or Amano shrimp, grow to be up to 2 inches long and eat algae, but the eggs will not hatch in freshwater. These are best suited for aquariums with fish. Crystal red shrimp can be upwards of $50 per shrimp for a good pattern and are very sensitive to water conditions, but will breed quickly if conditions are right. You wouldn't want to put those in with fish unless you like to give your fish very expensive snacks. Do a little research on the type of shrimp you are interested in and make sure it works with your current or planned setup.
Finally, shrimp should only be put in a mature tank as they are very sensitive to ammonia and nitrates. They are much more picky about water parameters. I've found that adding certain fertilizers containing trace elements will kill off my Cherry shrimp, but not my Amano shrimp (most likely due to the copper or other heavy metals in the fertilizer). A tank should not be medicated when shrimp are in it. They are often much more sensitive to medications than fish: copper being the most lethal. Even foods should be examined to make sure they do not contain copper.
Overall, shrimp are an excellent addition to an aquarium, and will add color, fun, and help clean the tank!
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