Next Fish Shipping Date: 3/25/24

Water Lettuce is a fast growing floating plant that is common in the fish keeping world. It is so fast growing that is banned in many states in all forms including AL, FL, CA, LA, MS, TX, and WI. This is less due to the toxicity and more due to the fact that this fast growing noxious weed can quickly overtake waterways and kill native plants. It will also cause oxygen depletion due to the thick surface cover it provides and starve the native fish of oxygen. Frankly it is our opinion the plant should be eliminated from the fish keeping hobby as it poses a real threat to native fauna and is easy to accidentally release during water changes.

But for Betta specifically this plant has calcium oxalate crystals located throughout the plant but most heavily in its thick roots which the Betta fish likes to nestle in. They are also prone to nibbling on them which can lead to illness and death. We have experienced this issue first hand and recommend against keeping these plants with your Betta.


  1. Thank for for this information, was looking at plants for my tank and was skeptical about this plant, glad to hear your experience and data

  2. I put water lettuce in my bettas tanks last night after being told it would be great for them. Within an hour one of my bettas had a wound on his head so I started researching the plants to make sure they couldn’t be the cause and while I don’t think they caused the wound, the wounded Betta has passed and the non wounded Betta is in rough shape and I don’t know what to do about it. I see everything saying it’s bad but nothing explaining what it’ll do or how to help if you make the mistake of putting them in so what can I do for him??? I’ve removed all of the plants and did major water change. Would an Epsom salt bath help?

    1. The best thing to do is to do a water change and then treat your fish with antibiotics. I recommend kanaplex. I hope he is recovering now. We do not monitor comments so I did not see this until today.

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