Hi.for my new tank I will be using white silica sand.i will be planting some plants in there and was wondering if I could put a layer of plant substrate in before I add the sand.thanks
You still use a vac for water changes. You want to hold it a little above the sand and make a swirling motion, this will kick up the poo and the sand should settle back down.
If the sand is clear and the tank not fully planted, you will need to vacuum to an extent. If the tank is heavily planted and foreground has a carpeting plant, you really wont need to do much at all