What's going on guys. I am new here so this is my first post. This site is great and I look forward to stopping by more often. Anyway I have a question regarding using sand in a freshwater tank. I currently have gravel in a 90 gallon tank with oscars, bengas, maylandi, parrots and electric blue. Is it ok to use sand instead of gravel. I have been thinking of changing and I think I have sold myself on the idea however I have read that there may be concerns about the calcium raising the PH. Does anyone have any experience with this or is this a bad idea. I was going to use Southdown sand from Home Depot. I really want to switch to sand but I don't want to create problems. Thanks