Koi pond update - No 7 - Skimmer leaking into wall?!

Videos back to back - You lucky lot! Went out this morning, noticed that the skimmer had been leaking into the back of the wall. Or at least, that's what it appeared. Pain!!
So I've made some adjustments/lots of silicone to try and rectify it. Also changed across from a 50lpm to 70lpm air pump for my moving bed/bio side in the profi. Hopefully we'll see if that solves.
If not, I guess I'll have to call the fibreglassers back to rectify it as we can't have it leaking into the pond wall :/.
Enjoy, and any questions as always, please ask :)
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