Sentence:  The plant is also very rare (related to <WSD>triffids</WSD> ... be wary) as it acts like a venus fly trap except it gives it's catches to the fish, a truly symbiotic relationship 
Meaning of the word marked with <WSD> tags:  Any of the anemones of the genus "Aiptasia" with poisonous tentacles, which are a pest in aquaria.