If your biofilter has been running all winter and there is no muck buildup in your pond there would be no need to do anything except check your water parameters as you have hopefully been doing through the winter. Adding bacteria is also unnecessary.So, just reporting back, now that we're nearly to April.
I put a heating element in the tank, and bought bales of hay to surround the metal stock tank. The heating element kept the water at around 50 degrees F all through the winter. I left my biofilter running. Left the fountain and box filter running, as well. The fish were active all winter long. I even fed them a couple of times with some spring/fall pellets. We definitely had a couple of weeks of deep freezes this winter, but through it all, the fish were just swimming around like they owned the place.
One of my water lilies is sending up pads already, even though it's been just above freezing, here. My hornwort has grown out of control (the fish don't eat it, so it's my submerged oxygenator), so I need to pull that out and cut it back a bit.
Here's my question, now, though. The water is completely clear, and since my biofilter was running all winter, I'm wondering how much cleaning should I do. I'm adding bacteria as I would do with any spring start-up, but I think I've got a decent slime coat, but the pond doesn't seem dirty at all. Should I still plan on switching out the water, cleaning, and whatnot?
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