Best Fish for Hard Water

Our top picks for species that love hard, alkaline water.

Looking for species that love hard, alkaline water? Here are the top picks from our species database, with adult size, minimum tank, and temperament. Tap any fish for its full care guide, then plan your tank with the stocking calculator.

• Assassin Snail (1.0", 5g min, Peaceful)
• Bala Shark (12.0", 120g min, Peaceful)
• Boesemani Rainbowfish (4.0", 30g min, Peaceful)
• Bronze Cory (2.8", 20g min, Peaceful)
• Cherry Shrimp (1.5", 5g min, Peaceful)
• Convict Cichlid (5.0", 30g min, Aggressive)
• Dwarf Mexican Crayfish (1.6", 5g min, Semi-aggressive)
• Electric Yellow Lab (4.0", 40g min, Semi-aggressive)
• Endler's Livebearer (1.0", 10g min, Peaceful)
• Firemouth Cichlid (6.0", 30g min, Semi-aggressive)
• Ghost Shrimp (1.5", 5g min, Peaceful)
• Gold Barb (2.8", 20g min, Peaceful)
• Goldfish (Fancy) (8.0", 20g min, Peaceful)
• Guppy (2.0", 10g min, Peaceful)
• Malaysian Trumpet Snail (1.0", 5g min, Peaceful)
• Molly (4.0", 20g min, Peaceful)
• Mystery Snail (2.0", 5g min, Peaceful)
• Nerite Snail (1.0", 5g min, Peaceful)
• Oscar (12.0", 55g min, Aggressive)
• Paradise Fish (4.0", 20g min, Aggressive)

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