A shrimp tank is the ideal "second tank" for freshwater hobbyists. Low maintenance, dramatic visual return on a small footprint, and a self-sustaining colony that breeds without intervention. The catch: shrimp are extremely sensitive to copper, water-parameter swings during molts, and ammonia spikes from overstocked or under-cycled tanks.
Decide first: Caridina or Neocaridina. They look similar but need different water profiles. Mixing them in the same tank stresses both populations.
Neocaridina (cherry shrimp variants - red, yellow, blue dream, blue velvet, green jade): hardier, prefers GH 8-10 / KH 3-6 / pH 7.0-7.8 (most US tap water works). $3-15 per specimen. Caridina (CRS, Taiwan Bee, Pinto, Galaxy): premium, prefers GH 4-6 / KH 0-1 / pH 5.5-6.5 (RO/DI water + remineralizer required). $25-300+ per specimen for high-grade lines.
Caridina: active substrate (Fluval Stratum, ADA Amazonia, Akadama) buffers pH down naturally. Substrate exhausts after 12-24 months and needs replacement. Neocaridina: inert substrate (sand, gravel, black diamond blasting media) is fine - they don't need acidic water.
Shrimp are extremely sensitive to ammonia. Cycle the tank fully (test ammonia + nitrite at 0, nitrate 5-20) before adding the first specimen. Adding shrimp to an uncycled tank kills 80%+ within 72 hours.
Use a TDS meter (handheld $15-30) to track total dissolved solids. Caridina target: TDS 100-150. Neocaridina: TDS 200-300. KH and GH measured with API or Salifert kits. Target temperature 70-76°F (lower end of tropical range - shrimp don't thrive at 80°F+).
Start with 10-20 specimens in a 10-20 gallon tank. Drip-acclimate 2-3 hours - shrimp are extremely sensitive to TDS swings. Within 2-4 months a healthy colony reaches 100+ specimens through breeding.
Overfeeding is the #1 cause of shrimp colony crashes. Feed Bee Shrimp Foods (Mosura, Shirakura, Bacter AE) 2-3 times per week, only as much as is consumed in 2-3 hours. Blanched zucchini or spinach 1x per week. Never leave uneaten food in the tank overnight.
Most plant fertilizers, fish medications, and brass pipe fittings contain copper. Even trace copper kills shrimp. Use shrimp-safe fertilizers (Salty Shrimp specific lines), never use copper-based ich treatments in a shrimp tank, and test new water sources for copper before introducing them.