OK so ive been reading a lot and im getting fixed answers on sand i was thinking about getting pool filter sand cause its white and i think it would look a lot better than gravel plus its cheaper i believe by me it was around 20 dollars for 50lbs. Anyways i believe pool filter sand is silica based, is this healthy for fish, i am thinking doing a cichlid tank or a piranha in my 55, a community type in a 30 and have a 10 which have no idea maybe a betta or something idk, or do i need to find quartz sand? Also if have any suggestions what to put in tanks it would help me i have been looking at fish for awhile so any help is appreciated.