I used to have alot of links to Talapia, crawfish and certain carp being raised on only DW but not any more. DW is a valuable addition to aquaponic systems as it is a high protein source feed. If a healthy balance can be obtained with it then all the better. There are chemical solutions but they are expensive and tricky.
I was always under the belief that DW was beneficial but I have always looked at it from an aquaculture point of view and not a pond owners.
Even tried to get it started in a 12ft diameter pool with crawfish but they ate it all so fast it didn't have a chance
