Live Crayfish will be 1 inch to 4 inches. Blue crayfish, also known as electric blue crayfish or blue lobsters, are popular aquarium pets due to their vibrant coloration. Proper care is essential to ensure their well-being. Here's a care guide for blue crayfish: Substrate: Use a substrate of fine gravel or sand to mimic the crayfish's natural habitat. Hiding Places: Include caves, rocks, and driftwood to create hiding spots for the crayfish. Cover: Make sure the tank has a tight-fitting lid as crayfish are skilled escape artists. Water Parameters: Temperature: Maintain the water temperature between 65-75°F (18-24°C). pH Level: Aim for a slightly alkaline pH between 7.5-8.0. Water Hardness: Keep the water moderately hard with a dGH of 8-15. Filtration: Use a reliable aquarium filter to maintain water quality. Water Quality: Regular Water Changes: Perform regular partial water changes (around 25% every two weeks) to remove accumulated waste.