Do you vacuum your gravel every time you change water? I'm planning on weekly 25% water changes once my tank is stocked but wondering if it's necessary to vacuum every time. At full stocking I'll have in a 29 gallon tank 5 ghost catfish 5 fancy skirt tetra 1 dwarf gourami (Wondering what else, if anything, I could add, but I'll start a new thread for that).