is my water too hard for plants?
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adapros - Posts: 16
- Joined: Mon Apr 11, 2022 5:57 am
is my water too hard for plants?
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?
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rusticfox - Posts: 103
- Joined: Tue Jan 11, 2022 4:54 am
Re: is my water too hard for plants?
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.
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sweetflake - Posts: 6
- Joined: Thu Oct 10, 2024 6:50 pm
Re: is my water too hard for plants?
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.
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adapros - Posts: 16
- Joined: Mon Apr 11, 2022 5:57 am
Re: is my water too hard for plants?
Nitrates are at 10 ppm, so not crazy high. I'll grab some almond leaves and see if that helps. Thanks!
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guppyMaster - Posts: 3
- Joined: Thu Oct 10, 2024 3:25 pm
Re: is my water too hard for plants?
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.
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waterworlds - Posts: 29
- Joined: Fri Dec 22, 2023 9:15 am
Re: is my water too hard for plants?
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.
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brooklynite - Posts: 5
- Joined: Thu Oct 10, 2024 2:19 am
Re: is my water too hard for plants?
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.
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Echoflux - Posts: 20
- Joined: Fri Dec 16, 2022 9:35 am
Re: is my water too hard for plants?
Crypts are solid, but they melt if you mess with them too much. Once they settle, though, they're golden.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.
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swift_man - Posts: 12
- Joined: Fri Sep 06, 2024 4:53 pm
Re: is my water too hard for plants?
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.
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specter - Posts: 2
- Joined: Wed Sep 07, 2022 8:40 pm
Re: is my water too hard for plants?
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.