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sera guide - Shrimps and crayfish

23 Water care Aquariums set up correctly require only little care. Successful breeders recommend to change 30 – 50% of the aquarium water weekly. This simulates rainfalls common in nature, which then increase the readiness to reproduce. The changed water can be some degrees colder. However, you should always condition the added water with sera aquatan or sera blackwater aquatan. The low tolerance of shrimps and crayfish regarding nitrate is another important rea- son for regular partial water changes. Elevated nitrate levels cause problems dur- ing exuviation. You can check the nitrate level with the sera NO3-Test kit. It is advisable to siphon the forming sludge off with the sera gravel washer during the partial water change. However, a small amount of sludge should remain inside the aquarium, as shrimps – especially juveniles – like to use it as an additional food source. You should not remove the exuvia the ani- mals discard during the exuviation. They contain valuable minerals and are usually completely eaten by the animals. 23