Originally Posted by
vinz
If the main patch has stopped but another patch is still growing well, then it might not be CO2 as that should be fairly uniform in your tank. Seems more like a localised problem which would suggest one or more of the following:
1. Circulation is not uniform and that patch is not getting the nutrients or CO2 it needs.
2. Shading by neighbouring plants.
3. Substrate there is exhausted.
If I'm not wrong, Hydrocotyle in general love nitrate. How much NO3 are you dosing per week?
In the photos I noticed what looks like dying moss? If the rooted plants are growing well, but non-rooted plants are not, I would wonder if they are getting enough nutrients from the water dosing.
In my experience with Aquasoil, they provide lots of N and P in the beginning, but starts to exhaust after the first year. Although yours is barely half year old, H triparta may have exhausted it's patch. Snip some off and replant elsewhere in the tank and see how it reacts.
My reply is not definitive, just throwing in my 2 cents for you to consider. CO2 is the easiest to tackle, so you can start there and see if the plants react. If yes, good. If not, look elsewhere.
In the long run, I would try dimming the lights a bit (if your set has dimming controls), observe for a few weeks and see it you like how the plants grow out. Just to balance growth rates vs aesthetics.
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