hi, i would love your opinions on what sort of sand i should use for my tanks, i have a 75litre molly tank and am going to be starting a 54litre tank for my peppered corys and 2 platys i have removed from the molly tank so i can add salt to it and redo it better to suit them. So i know that the corys like soft water and fine sand its just a matter of whats going to be best and affordable. Im leaning towards play sand or pool filter sand for the cory tank your opinions would be greatly appreciated. Also another question i thought that i could use beach sand for my molly tank since they like brackish water if i boiled it and cleaned and soaked it thoroughly enough, but some people say not to use it no matter what u do because of other pollutants and others say you can do it. So i guess what i want to know is would beach sand be best for mollys and or play sand,pool filter sand? My tank is a planted one and i have more plants ive ordered online coming soon i was going to try and order some flourite to layer underneath the substrate i end up deciding is best.