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Old 01-17-2019, 07:26 AM   #1 (permalink)
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Default Need help on aquatic plant.

I'm having some problems with my plant recently. Can anyone give me some advices?
1) brownish patch appear on the edge of some leaves, while some of the leaves are normal. I suspect nutrients deficiency, had try to dose the dry fertilizer, eg potassium sulphate, calcium sulphate and magnesium sulphate few days ago, but nothing happened. Do I need to increase the dosage?

2) notice some blackish filaments on the edge of the leaves. Is that some kind of Algae? My otto cat don't seem to eat that.

Thanks.
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Old 01-17-2019, 07:59 AM   #2 (permalink)
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Default Re: Need help on aquatic plant.

Welcome to APC!

How do the other plants look? What size tank is it, and what lighting do you have? The black filaments are black brush algae, as best I can tell. It is best to remove leaves that are dying or dead, because algae likes to grow on unhealthy or dead leaves. That looks like a sword plant to me. If it is you can either cut off the bad leaves or pull down on them so they break off.

https://www.aquaticplantcentral.com/...ing-guide.html describes an easy way to fertilize the plants, which has worked for a lot of people. Notice that you need nitrogen (nitrates), phosphorous (phosphates), and potassium in the biggest amounts. You also need carbon, preferably carbon dioxide, and a lot of trace elements.
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Old 01-17-2019, 05:49 PM   #3 (permalink)
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My tank is 30 gallons, with 2 10watt LED light. My carpet plant n fast growing stem plant seem no problem. But the plant below always have decolorized leaves.

Will try to follow the guidelines for the dosing. Thanks for the advices. 😁
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Old 01-17-2019, 08:18 PM   #4 (permalink)
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Default Re: Need help on aquatic plant.

The discolored leaf plants look like Sagittarius subulata, or dwarf sagittarius. They are very robust growers. Their discoloration and dying leaves make me think there is too little nitrates and probably too little potassium, dosed as potassium nitrate. If you follow that guide for dosing you will have plenty of potassium nitrate.
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Old 01-18-2019, 03:07 AM   #5 (permalink)
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Default Re: Need help on aquatic plant.

Looks like what hoppy said pretty much, low nitrates. and possibly potassium + magnesium.
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