Hi, thanks for the answer.
Yes, both tanks are trickle filters, however, very very nosey! I've quieted them down by putting a bit of filter sponge over the end of the filter bit. (God, terrible descriptions click here I took a photo, my finger is pointing to the sponge I put in there, filter is obvious off) to stop the "waterfall" because it makes it impossible to sleep. The water still gets disturbed from the water exiting the filter, but it did stop the bubbles flowing down into the water around 90%. I was worried the fish may not get enough air? I do not plan on overstocking the tanks.
...I also do like bubbles.
Ok, so jager 100 it is, and I'll definitely get one of those glass thermometers.