One more quick question about filters. The filter I have, like most filters, sucks up the water through a sponge/mesh thing, passes the water through the cartridges and then out over a mini ramp looking thing. Now, common sense tells me not to let the water flow past the ramp when I'm doing my 25% water changes. The only problem is that as the water evaporates, the water dripping off the ramp starts to splash and make loud noises. Would it be safe to fill the water up the the very top of the tank, all the way past the ramp? Or is that a bad idea?