Originally Posted by HN1
From what I understand, the main reasons for not using PFS in SW
(and I'm a huge fan of it for FW
) is that it is reported to cause longer lived and more pronounced diatom problems and lacks the buffering of aragonite.
That is partially true. Sand other than aragonite is usually silica based and that silica will get released into the system which can cause a diatom bloom.
Aragonite sand in a SW
aquarium DOES NOT buffer anything. The pH needs to be around 7.2 before the aragonite starts to dissolve and give off buffering affects. If the pH of a SW
tank is 7.2, you will have lots of dead creatures in it and buffering should be the least of your worries. Aragonite sand WILL buffer a FW
tank because of the typically lower pH.