another thing that worries me? if you dont know how many guppies you have, and they are all related, eventually you are going to be come overrun with guppies, all interbred, and probally deformed and shortened life span. its important to sort out your stocking levels, none may have died yet, but in the future, who knows, lots could die. and not to be funny, but the attitude " i dont care" doesnt help. you need to care with fish, or problems are going to occur. i would keep the plants, and the pot cave thing. i am a fan of sand, but those pebbles do look good. i would still have a layer of substrate on the bottom, with the stones on top.