Rotala rotundifolia stem breakage - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 02-04-2013, 08:27 PM Thread Starter
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Rotala rotundifolia stem breakage

I have a lower light tank that I fertilize every other day with the Macro/Micro nutrient mix, plus extra potassium.

Most of the plants are doing well, but my rotala rotundifolia is experiencing upper stems that get soft and black, then break off without warning. These aren't the base of the stem. They're halfway up. Ditto for this large feathery plant that usually grows like crazy. Even the larger rooted bundles are just disintegrating.

Meanwhile, the java fern, anubias, moss, melon sword, crypt retrospiralis etc. are growing just fine.

What's going on?
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post #2 of 7 (permalink) Old 02-04-2013, 08:51 PM
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What does your macro fertilizer contain? How often you do water changes? Rotundifolia it's a weed in my tank. I give it away for free as it grows to the surface and shades other plants. Near the surface it's full of shoots.

I suspect a Ca deficiency or something in excess.
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post #3 of 7 (permalink) Old 02-05-2013, 12:40 AM Thread Starter
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Quote:
Originally Posted by danielt View Post
What does your macro fertilizer contain? How often you do water changes? Rotundifolia it's a weed in my tank. I give it away for free as it grows to the surface and shades other plants. Near the surface it's full of shoots.

I suspect a Ca deficiency or something in excess.
I am using the Aquarium Fertilizer Macro Nutrient Mix + CSM+B. It doesn't have any Ca2+. I may need to dose that separately with some limewater. It was growing really well until recently. Most of its stems are doing well. It's a recent thing.

I do water changes about once ever 1-2 weeks, usually around 40% of the water. I think I'm overdosing ferts.
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post #4 of 7 (permalink) Old 02-05-2013, 10:26 AM
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You may try gipsum (CaSO4) or Calcium Chloride (CaCl2). Lime will raise the kH also. And dose just a little. Abrupt shifts in gH may cause problems. I lost plants like Staurogyne to gH swings and other might be affected too.

Found a bird mineral stone that contained three forms of Ca and my last water measurement revealed it raised only the gH. Look them up in the pet store at bird food. It will slowly dissolve in water if you don't put it in a high flow area.
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post #5 of 7 (permalink) Old 02-05-2013, 05:42 PM Thread Starter
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Originally Posted by danielt View Post
Found a bird mineral stone that contained three forms of Ca and my last water measurement revealed it raised only the gH. Look them up in the pet store at bird food. It will slowly dissolve in water if you don't put it in a high flow area.
Oh, right, cuttlebone. If you don't give your turtles calcium-rich food, you can feed them that.

I'll try some calcium and see what happens there. It's very odd seeing all my stems decapitated.
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post #6 of 7 (permalink) Old 02-05-2013, 05:50 PM
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Not cuttlebone. That will increase kH too. This is a cube, mine was pinkish. This one contains CaSO4 and other trace minerals. Cuttlebone is rich in lime if I'm not mistaken.
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post #7 of 7 (permalink) Old 02-05-2013, 06:05 PM
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Its probably CO2 or a low light issue. I have mine growing in medium light and CO2 injection and it has been growing nicely.
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