You finally have your beautifully glowing pond with your free flowing waterfall and bright green aquatic flora, but something doesn’t seem right. Your once active fish don’t look very healthy or lively anymore. There may be a few different reasons why your fish are acting this way, and with a few small changes, they will be back to ruling the pond in no time. The first of these is a lack of oxygen. Testing kits are available to monitor oxygen levels in your pond. To improve the oxygen content in your pond for your little swimming friends, increase the water movement, install an aeration device, or add plants that decrease algae growth. Another possible reason for your lackadaisical fish could be the overcrowding of fish. There should be 1 to 2 inches of fish length per square foot of pond. The final reason is the possibility of too much chlorine in the water, which is potentially deadly to fish. Chlorine testing kits are available to check for this. If your fish are not their vibrant, spunky selves that they used to be, one or multiple of these easily solvable problems may be the culprits.