Planted Tank Guru
Join Date: Nov 2005
Location: Saint Joseph, Illinois
Why is hard water a problem? For most people it isn't.
Goldfish are exceptionally adaptable, and I have seen them in almost straight R/O and liquid rock water. Perhaps some of the very expensive rare breeds might be picky, but certainly not the majority.
If you are one of the few, get rid of the rocks and buy an R/O unit. Problem solved. R/O units can be had for $130 shipped on Ebay, and it will be around 100GPD. You an justify the cost by using it for ironing water, houseplants, and drinking/cooking.
Some cabomba species like hard water, most plants are oblivious to hardness/alkalinity/pH
ADA Aquasoil will lower pH and hardness, but not indefinitely.
In college....so no aquariums for a while.....
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