is my water too hard for plants?

Talk about your fresh water plants here
User avatar
adapros
Posts: 16
Joined: Mon Apr 11, 2022 5:57 am

is my water too hard for plants?

Post by adapros »

My Anubias and Java Fern are looking rough, leaves are kinda yellowing and brittle. Water's at 12 dGH, pH 7.8. Tank's a 20 gallon with Fluval Stratum, LED lights on 8 hours, CO2 at 1 bubble per second. Fish are chill, just some Tetras and a Betta. Am I messing with the wrong plants for my water?
User avatar
rusticfox
Posts: 103
Joined: Tue Jan 11, 2022 4:54 am

Re: is my water too hard for plants?

Post by rusticfox »

12 dGH is pretty hard, dude. Anubias can handle it, but Java Fern might struggle. You could try adding some driftwood or almond leaves to soften things up. What's your nitrate level? High nitrates plus hard water can stress plants out.
sweetflake
Posts: 6
Joined: Thu Oct 10, 2024 6:50 pm

Re: is my water too hard for plants?

Post by sweetflake »

Hard water can definitely limit nutrient uptake for some plants. Have you tested for iron or magnesium deficiencies? Yellowing leaves often point to that. A liquid fertilizer like Seachem Flourish might help, but long-term, you might want to consider RO water if you're serious about keeping sensitive species.
User avatar
adapros
Posts: 16
Joined: Mon Apr 11, 2022 5:57 am

Re: is my water too hard for plants?

Post by adapros »

rusticfox wrote: Mon Aug 18, 2025 3:44 am 12 dGH is pretty hard, dude. Anubias can handle it, but Java Fern might struggle. You could try adding some driftwood or almond leaves to soften things up. What's your nitrate level? High nitrates plus hard water can stress plants out.
Nitrates are at 10 ppm, so not crazy high. I'll grab some almond leaves and see if that helps. Thanks!
guppyMaster
Posts: 3
Joined: Thu Oct 10, 2024 3:25 pm

Re: is my water too hard for plants?

Post by guppyMaster »

If you're sticking with hard water, swap the Java Fern for something like Vallisneria or Amazon Sword. They're way more forgiving. Also, check your lighting—too much can exacerbate nutrient deficiencies if the plants can't keep up.
User avatar
waterworlds
Posts: 29
Joined: Fri Dec 22, 2023 9:15 am

Re: is my water too hard for plants?

Post by waterworlds »

I've had success with Cryptocoryne in hard water setups. They're slow growers but tough as nails. Just make sure your substrate has enough nutrients. Root tabs can be a game-changer if you're not using them already.
User avatar
brooklynite
Posts: 5
Joined: Thu Oct 10, 2024 2:19 am

Re: is my water too hard for plants?

Post by brooklynite »

Yo, my water's like liquid rock, and my plants were struggling too. Switched to RO mixed with tap, and boom, everything's green again. It's a hassle, but worth it if you're into fancy plants.
User avatar
Echoflux
Posts: 20
Joined: Fri Dec 16, 2022 9:35 am

Re: is my water too hard for plants?

Post by Echoflux »

waterworlds wrote: Mon Aug 18, 2025 7:48 am I've had success with Cryptocoryne in hard water setups. They're slow growers but tough as nails. Just make sure your substrate has enough nutrients. Root tabs can be a game-changer if you're not using them already.
Crypts are solid, but they melt if you mess with them too much. Once they settle, though, they're golden.
User avatar
swift_man
Posts: 12
Joined: Fri Sep 06, 2024 4:53 pm

Re: is my water too hard for plants?

Post by swift_man »

Your CO2 might be part of the issue. At 1 bubble per second in a 20 gallon, it's likely not enough for high-light plants. Either bump it up or dial back the light to 6 hours. Hard water plus low CO2 is a double whammy.
specter
Posts: 2
Joined: Wed Sep 07, 2022 8:40 pm

Re: is my water too hard for plants?

Post by specter »

Never had luck with Java Fern in hard water. Switched to Hornwort and it's thriving. Doesn't care about params, just grows like crazy.
Post Reply