duno bout moss....but the fish size....take out alota panfish and some bass...you kno whats in there i dont so its hard to say what will work...my friend has a pond and had many fish...only a few big bass...all rest were small only a few decint gills...my dad told us to remove mostly gills and leave a handfull...this was prespawn....after spawn we had alota bass live that never did b4...and this fish got alot bigger by fall...thats all i can say...our project was ruind...ppl that have a camp by his fish on it and took all the big fish out!!!! theres barely nething left!! and my friends dad is to nice to say nething...so its ruined...good luck

mauser06