Thanks for those tank shots mate, you obviously know what you're doing
Looking forward to seeing how you build this magnetic weir thingy - i'm still worried lol.
You don't need to worry Biggles I do lol.
Meh if it works great, if it doesn't no biggy I can just silicone it and move on

I may put up a 3D render I have of the weir design so everyone can see how it will look.