I have had my cichlid tank for a while now (5-6 months?) Everyone is now doing great! There is a lot of digging going on and i don't want my slate rocks to fall so i will be getting some plastic grating to go under the sand which the rocks will sit on. My idea is, suck half the sand out and place down half the plastic grate.. then fill the holes slowly with sand, place the rocks ontop then sand around. Then maybe wait the next day to do the other side? Should i wash the sand once its out before i put it back? I'm not sure what i should do. I never disturb my sand unless i am rearranging the slate (about every month) but never the whole thing. Please help! Thank you