Ok folks i have has my RSM 130 (34 gal) set up for little over a year now and its doing great! The san i got is bigger then most sand i see in tanks. How would i go about switching out the sand with out killing everything in the tank. I know if you stir up sand bed it can release gases. I have a deep sand bed btw. Here is a pic of the sand i have in it now. The main reason i want to change the sand to a finer sand is i want a sand sifting goby!