I use to do it everytime I did a WC... Now I try to do it at least once a week. Usually more on my 29g.
My severum started 'redecorating' one corner of the tank about a week ago. She made a bare spot in the corner, and started spitting rocks all over the sand I tried so hard to keep neat...lol... Hopefully it's just a phase.
the one thing i dont like is i think that sevs start to look mean when they get older
lol know what i mean like when they r little they look so innocent and then when they are big there face looks angry lol