+1 on Tigerbarbs
For the longest time I tried to keep corals with tapwater and had very little success and LOTS of nuisance algae. I broke down and bought an RO
unit and it became easy to keep LPS
and Soft corals. They just thrived. That was the missing piece of the puzzle I put off for a long time. If I had to pick one piece of equipment that is a necessity for a reef tank, it would be an RO
unit. You can get away with tap water for fish, but not corals IMHO
. These guys have decent units for a good price.
You don't need a large capacity unit. Whatever you can afford. Just make sure to get a TDS
meter with it to test what is coming out. This will make sure the water is pure and you will know when the resins start to fail and need to be replaced.