What size are you fish? I haven't run into any of these issues but I might not be keeping them in the tank as long as you are. I hatch them and keep them until they are about 5-6" before they go into the pond.
In the last video I posted a few days ago when the water was clear they looked to be a little bigger than that. I like the water being clear. Adding plants to feed the fish is another idea instead of feeding them algae. They seem to be growing incredibly fast. Even the goldfish I put in there are way bigger than the ones in the pool they came out of. I want to try either floating raft or a bell siphon bed. I think I can grow a better variety in a gravel bed with a bell siphon but I haven't figured out how to do it with the huge fiberglass tubs I am getting without adding massive amounts of pumps or drastically modifying the setup... Whatever design I come up with I now see is going to also have to have move-ability factored in.
