Page 1 of 2
Best Plants for a Low KH Tank
Posted: Thu Aug 28, 2025 7:13 pm
by sonyx
I've got a 20 gallon low KH tank, around 3 dKH, and I'm struggling to find plants that thrive. My Anubias are barely growing, and the Java Fern is just surviving, not thriving. Any suggestions for plants that'll do well in these conditions?
Re: Best Plants for a Low KH Tank
Posted: Thu Aug 28, 2025 7:19 pm
by gatormax
Yo, sonyx, I feel you. Low KH tanks can be a pain. Try some Cryptocoryne Wendtii, they're chill with soft water. Mine's been growing like crazy in my 15 gallon, same KH as yours. Just gotta keep the lighting low and avoid too much CO2.
Re: Best Plants for a Low KH Tank
Posted: Thu Aug 28, 2025 7:29 pm
by lula
I've had good luck with Amazon Swords in my low KH tank. They're not picky about hardness as long as you give 'em enough root tabs. Also, floating plants like Frogbit help shade the tank, which keeps things stable.
Re: Best Plants for a Low KH Tank
Posted: Thu Aug 28, 2025 8:45 pm
by firedrop
Cryptocoryne species are indeed a solid choice for low KH tanks. They adapt well to soft water and don't require high light. Another option is Bucephalandra, which thrives in similar conditions. Ensure your substrate is nutrient-rich for optimal growth.
Re: Best Plants for a Low KH Tank
Posted: Thu Aug 28, 2025 8:54 pm
by akirix
My tank's KH is around 2, and I've found that Mosses like Java Moss and Christmas Moss do really well. They don't need much light or CO2, and they're great for providing cover for shrimp and small fish.
Re: Best Plants for a Low KH Tank
Posted: Thu Aug 28, 2025 10:05 pm
by kalexi
firedrop wrote: ↑Thu Aug 28, 2025 8:45 pm
Cryptocoryne species are indeed a solid choice for low KH tanks. They adapt well to soft water and don't require high light. Another option is Bucephalandra, which thrives in similar conditions. Ensure your substrate is nutrient-rich for optimal growth.
I second this. Bucephalandra is a fantastic choice. It's slow-growing but very hardy once established. Pair it with a good liquid fertilizer for best results.
Re: Best Plants for a Low KH Tank
Posted: Thu Aug 28, 2025 10:58 pm
by catalyst
Hey, don't forget about Hornwort! It's a floating plant that's super easy to grow in low KH water. Plus, it helps with water quality by absorbing nitrates. Just be ready to trim it often, 'cause it grows like crazy.
Re: Best Plants for a Low KH Tank
Posted: Fri Aug 29, 2025 12:11 am
by swampdweller
I've had success with Vallisneria in my low KH tank. It's a background plant that grows tall and spreads runners. Just make sure you've got enough space, 'cause it can take over if you're not careful.
Re: Best Plants for a Low KH Tank
Posted: Fri Aug 29, 2025 2:03 am
by clouds
akirix wrote: ↑Thu Aug 28, 2025 8:54 pm
My tank's KH is around 2, and I've found that Mosses like Java Moss and Christmas Moss do really well. They don't need much light or CO2, and they're great for providing cover for shrimp and small fish.
Java Moss is a great suggestion. It's practically indestructible and works well in low-tech setups. Just tie it to driftwood or rocks for a natural look.
Re: Best Plants for a Low KH Tank
Posted: Fri Aug 29, 2025 3:08 am
by sonyx
Thanks for all the suggestions, everyone! I'm gonna try Cryptocoryne and Bucephalandra first. Appreciate the help.