Personally? I wouldn't worry about disease. Why would it affect a Forage Pond and not the main pond? Same fish are there.....
A client has had a forage pond for a number of years and the same fish are in it year after year.
I guess the logic is that fish are much more densely packed into a forage pond, hence the risk of disease spreading is higher than main BOW. Like some people say about bird feeders.
Glad to hear your clients haven't had that problem. Even without that issue, probably will go TP route next year because I can raise more with lower risk of fish kill due to heat/O2 issues. Also because I might be able to raise prawns with them.
