i have the perfect PH for cichlids... african cichlids that is... my PH is about 8.2, and my water is so hard its like rock. the thing is i want to keep discus. i was trying to decide the best way to go about lowering my PH and softening my water. so far i have come up with peat, or RO. i dont particularly want to buy that much RO though... especially with the frequency of WCs needed. but i also have questions about peat, like how fast does it work? will it stop lowering the hardness and PH after a certain number is reached? do i leave it in the tank? does it need to be replaced often? would it be best to go with peat, or purchase an RO unit? are there alternatives besides these?