Hi, your red plants appears to be ludwigia glandulosa. The plant may break the water surface and grow taller. If you have a fan blowing on the surface the leaves will probably dry up. If you do not have a fan the plant will just continue to grow.
If you prefer not to have it grow above the water surface you can trim and replant the trimmed portion into the substrate.
Your plants look ok. So I guess the light is sufficient.
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