Originally Posted by
florida joe
http:///forum/post/3278483
I am sure Bang can give you a better explanation but simply put the alkalinity of water is its ability to act as a buffer against PH swings. It has been noted that Low Alkalinity levels can cause Xenia pulsing to decrease or cease altogether due to these swings, so alkalinity levels should be kept above a minimum of 2.5meq/l.
Bang please correct me if i am mistaken
Sounds good to me as reason #1. There are two other reasons as well that may not be quite as important as #1 but a close second and third.
#2 - Xenia build structures called Sclerites for maintaining body and frond structure. Without sclerites Xenia would be unable to stand upright and wave its fronds. These Sclerites are nearly pure Calcium carbonate. When Alkalinity is low there is insufficient Carbonate to build Sclerites. When ALK is very low the Sclerites may actually begin to dissolve.
#3 - Most spacies of Xenia are very intolerant of changes in the environment. This plays a little into reason #1 with the changing PH but also with just a direct change in Alkalinity. Once ALK is low it tends to continue to drop rapidly and Xenia will often react negatively to that change.