Thanks for the prompt reply
Got it from Greenline 3 weeks ago now actually. It is tied to some lava rock (taiwan moss pictured) and the flow from the spray bar pretty much hits it first after being deflected from the front so I don't think I can improve that. The temperature has been on the high side recently (27-28) due to the recent unseasonal warmth in sunny manchester. I read that vesicularia species do better in cooler water, but taxiphyllum sp. is meant to do better at higher temps, which is why I thought I'd try the taiwan stuff. Unfortunately neither seems to be doing well.
Thanks for the offer, and I hope to take you up on that in the future, as planning to grow a moss wall. However taking things slowly at the moment and seeing how things go with these pieces first as little point throwing in a whole lot more if it all just turns to brown mush.
Unsure if grown emersed or not- do you think there's still hope or just cut loose and try again in different set up (cooler?)