I wandered out to the Aquaponics system for the first time in ages because it was making a slightly different sound, and it turned out to be a partial blockage of the pipe work.
Blocked with tomato roots.
I've been expecting some problems because when I pruned back the four tomato plants that are still growing from last year, I accidentally killed one by snapping it off at the base. The roots are all meshed together with it's three tomato plant buddies, so there was no way to get them out. I figured it would work it's way out in the end. It probably would have. The system was still working, with some water going through my overflow. The overflow exits from the surface of the fish tank water, where in normal operation, the water exits from the bottom via a solids lifting overflow. As a result it's unlikely that both would be blocked at the same time.
Anyway, everything seems to be ticking along nicely.
I don't really know how big this fish is (I'd guess around 40+cm), but it's in really good condition. They're not just long, but really heavy as well. Heavy looking that is. I wouldn't like to try to catch one, I think it would be a little disruptive.
I'm not sure if this is the bigger of the two, but one of them now looks like this...
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