Which is nice.
Some stuff take a long time to grow.
I have very low levels of nitrate (plant num-nums) in my system due to having only two fish, and sleepy ones at that.
The water temperatures are sitting at around 10c, and the growhouse has similar air temperatures.
All that means my fish are almost dormant, and only eat a tiny amount every second day. No feed, and no activity mean no plant nutrient. I should have got some trout, (trout love the cold water) but I was waiting for some more silver perch, and also expected this grow house to keep temperatures up a bit higher. Unfortunately, the fish farm I normally get them from, had some kind of spawning fail, so I didn't get any.
In other news in the grow house, there is no new news. Everything is sleeping except lettuce.
I think I need to seal up my solar panel, and connect it to my fish tank heater. It's a 300 watt heater, which is quite powerful for a fish tank heater, but I suspect it won't do a lot in a thousand liters of water that's outside.
120 Things in 20 years needs to have bought a bigger and better grow house if it wanted decent aquaponics carrot growth.