Hi Patchworks,
Some invertebrates, and some fish, are very sensitive to copper in the water, the effects can be fatal. The problem worsens if water is only added to replace evaporation, and regular water changes are not performed. Copper pipes in our homes can be a source the problem as well.
That said, why use copper for your project? You didn't mention what your project is, but how about PVC or clear plastic tubing as an alternative?
Some invertebrates, and some fish, are very sensitive to copper in the water, the effects can be fatal. The problem worsens if water is only added to replace evaporation, and regular water changes are not performed. Copper pipes in our homes can be a source the problem as well.
That said, why use copper for your project? You didn't mention what your project is, but how about PVC or clear plastic tubing as an alternative?