Ok so when I started my tank 8 months or so ago I used just a 20lb bag of LS in my 55g. Not a whole lot of sand. Now I'm thinking of makeing it a DSB how would I do this without causing a cycle? Should I just get some dry sand or would I be better getting more LS? And how do y'all clean your...

well right now in my extra tank i have about a 1 inch sand bed. i want to get a mantis so i want to make it thicker. do i just add more sand ontop? or do i completely get rid of the sand bed and start over?