I have a planted tank with Tahitian Moon Sand. I've had terrible luck keeping plecos in it. Loaches, Tetras, Dwarf Cichlids all do fine. Plecos die early and often. I've lost several Gold Nuggets and Queen Arabesques, even a pair of Bristlenose adults didn't last more than 6 months. I am wondering if they are accidentally ingesting the sand and dying from it. Any thoughts?