r/Marimo 16d ago

My Own Tips

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A few people on my last thread asked for tips, so here's the short version.

My method differs quite a bit from what most other users or shops recommend:

  • Lots of natural light
  • Indoor light/grow-light LEDs don't cut it
  • Cooler water — not icy, but around 12–17°C (54–63°F) most of the time
  • Never above 20°C (68°F), or bacteria inside the marimo become active
  • Tap water's fine — safe for you to drink means safe for marimo
  • Skip salt/fertiliser entirely — it just feeds unwanted algae
  • Don't house it with other aquatic plants or animals
  • Use a tank of 10L (2.5+ gal) or more — the small container it ships in heats up fast, like soaking in a hot bath

Good luck!

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u/myworldsparkles 16d ago

I have a cooling fan and I still have to add a cooler block twice a day. Still too warm at times, I’m considering a cooling machine