hi, im about to transfer everything in my 40g to a 55g. since i have to get more substrate, i thought i would get something better than what i have right now. currently my substrate consists of sand, crushed coral, and gravel all combined from my many years of fish keeping... the plants are doing fine in this gravel but since i need to get more to fill up my 55, what kind of substrate do you guys recommend?? i was thinking about the flourish substrate... anyone use this? play sand? pool filter sand? or soil even?? any opinions, advice, tips are greatly appreciated... thanks