ill have to see with how my fish act on the cover, and as for buffers do i really need any, because we have well water, so the water was naturally buffered with limestone. the ph is 8.2
Actually you would do well to use di water. If your well water is anything like mine ,which I'm sure it is, then it will have low (but still too high) phosphate and that alkalinity will be around 6 meq/l (15 - 16 dKH). That's really too high and will give you some problems. Fish will tolerate it but you may have problems with corals.