This question Would my fish benefit from snails in their pot pond? asks about having snails in a fish pond/pot to reduce algae.
My fish are happily living in a outdoor ceramic pots, approx 80cm high x 50 cm in diameter. They have fish pond mud, sand and aquatic plants. The walls have algae, which is hard to see, unless the sun is shining through one of the pots in the morning, as the pots are painted black (on the outside).
I am concerned that the coming summer may mean an increase in algae and am wondering how this will affect my fish and if there are signs I should look for, both within the environment and the fish to see if algae is at an unhealthy level?