What adding RO water will do is reduce that alkalinity of the water.

Be careful that you do not allow the pH to fall too low after reducing the alkalinity. With a reduced capacity for buffering acids and bases, the tank will now be more susceptible to fluctuating pH levels. Shell-based substrates, biological processes and tannins that leach out of any driftwood in the tank are all capable of raising or lowering the pH outside of tolerable levels. Monitor your pH levels regularly with an aquarium test kit. This will help you to catch changing pH levels quickly, before the water becomes dangerous for your fish.

can safely be added directly to the fish tank to correct a pH/alkalinity imbalance.

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High Alkalinity - How It Affects Fish And Equipment

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pH And Alkalinity In A Saltwater Aquarium - Saltwater Aquarium Hobby

Get a reliable aquarium alkalinity test. With a wide range of options to choose from, PetSmart makes it easy to get the fish tank alkalinity tests you need. Certain aquarium decorations can raise pH. In fact, saltwater aquarium hobbyists often rely on this. Many of the same products can work in a freshwater tank if you desire a high pH. Crushed coral sand or calcium-rich rocks like limestone or tufa can slowly leach calcium into the water, raising the pH, alkalinity and calcium levels of aquarium water. This mimics the hard, alkaline water where some species of aquarium fish originate.

How to Get the Alkalinity Up in an Aquarium - Pets

Carbon dioxide, bicarbonate, and carbonate are all just different forms of inorganic carbon in water. Which species predominates is determined by pH. CO2 predominates at low pH, HCO3- at near neutral pH, and CO3-- at high pH. In fact, alkalinity, pH, and CO2 each may be calculated from the other two. In recirculation aquaculture, the tendency is for alkalinity to decline over time as it performs its buffering action. If buffering capacity falls too low, the CO2 produced by the fish and bacteria will cause a decrease in pH. If pH falls below 7, it can cause problems. The solution is for the aquaculturist to periodically to replace lost buffering capacity by adding sodium bicarbonate, thus keeping alkalinity up and pH in the desired range. Scoopfuls of sodium bicarbonate can safely be added directly to the fish tank to correct a pH/alkalinity imbalance. The other part of pH management involves CO2 stripping. When air is used as an oxygen source the aeration needed to increase the oxygen will also remove CO2, so CO2 stripping is essentially part of aeration. When liquid oxygen is employed, however, dedicated CO2 stripping is often required. This is typically done prior to oxygenation so that any O2 added from the air spares costly LOX. A typical CO2 stripper is a cylinder filled with inert substrate and a flow of air running counter to the trickle of water over the substrate. The substrate breaks the water flow into a large surface area and the opposite flow of water and air optimizes the gas exchange.

Your aquarium is either acidic, neutral or alkaline