The carp have arrived, and seem to be enjoying their new home. It was slightly surreal coming home to a box of live fish, but after a gentle introduction to our tanks they all swam off happily, showing no ill effects.

We got a couple of kilos of carp food delivered with the fish, but as they’re far more omnivorous than the trout we’re keen to try something a bit more home-grown.

Some of our sumps are doing well at growing duckweed so I thought that would be a good start and added a net-full of duckweed to their tank.

They’re much gentler feeders than the trout, so I haven’t seen them aggressively attacking clumps of weed, but it is steadily disappearing.

At this stage, with tiny digestive systems, they need to be able to “graze” through the day, and I think the duckweed helps with that between their main feedtimes.

As they grow we’ll try to expand their diet further to see if we can eventually produce all their feed in-house – ideally from waste, or areas we’re not using for our food.

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