I have pretty hard water here GH 12 KH 10 last time I checked. Only until I started using Aquasoil which made the water softer (3 and 4) did I have success with Toninas and Eriocaulon. Otherwise, they would turn brown and die. So I would say they do require softer water to thrive. Tonina belem grews quickly and a bit "weedy.
I'm surprised to hear that it's not available in the UK after all this time. Maybe that's why they haven't become popular in aquascapes? The UK and other folks maybe haven't had the chance to grow these beautiful plants.
-John N.
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