UPDATE

Overnight air temperature was, -8*C. I have a 30w aquarium heater in the sump tank. This morning the main tank thermometer was 3.4*C.

No time to look before going to work! Truth is I could not deal with it at this time of the morning.

Home around four pm.

The main tank has carp. The secondary trout. Phew! All good.

In the grow beds. Think cold frame NOT greenhouse. I have winter cabbages, beetroot, watercress, spinach and winter broad beans. Watercress looking a bit sorry for it self but all else not too bad. The winter BB were planted before Christmas and are about 15 cms tall. First time for this crop. So far. OK.

Last year has been tough. I decide to add carp. I used an online supplier.

Delivery after delivery were infected. IMHO with an existing fungal/bacteria.

They had a guarantee. So in fairness when I complained they were replaced.

I lost four months with fish dying in quarantine. I added a UV light to my Q system. Helped a bit but again IMHO did not treat the already infected fish.

Once again I went To Bibury Trout Farm. I have to say Martin the Fishery manager is great. To attempt to catch up I have overstocked the Q tank with larger trout. To cope with this I am a running a second pump on continuos flow. This pumps FT> pre-filter>bio-filter>FT The main pump is on 15/45.

Until recently I had kept the UV light on. It’s only 9W. I have now switched it off.

To return again to the carp.

The initial delivery was common carp. 50% survival. I then decided to switch to Crucian Carp. It was these that I had all the trouble with.

The fishery suggested that it was just too warm for transportation in the summer. Ice packs were included in the boxes. The October delivery 95% fatalities. At this point I gave up.

I don’t know.

I do want to stock Crucian Carp.