Right, now that I've got a plan for the spraybars, onto the more difficult bit...
I'm going to need two of these running parallel to each other along the back; one in 18mm tube for the Eheim Pro and one in 20mm tube for an Eheim Compact+ 3000 powerhead and I'd like an elegant solution for connecting to the filter and the pump.
The powerhead pump will (probably) be mounted inside the aquarium close to the back wall so it should be relatively easy to connect it to the spraybar with a piece of Eheim flexible tubing (unless there is a better solution). The connection to the filter is more difficult though in that it will need a couple of 90 degree bends to get through the hood at the rear and close to the back wall (at present I'm using one of the Eheim installation sets, which comes with a couple of elbows).
I can see three solutions of varying simplicity and ugliness:
(1) A series of green Eheim elbow (not quite 90 degree) connectors held together with Eheim green flexible tubing. Simple, but fairly ugly.
(2) More of a question than a solution: can Eheim flexible tubing be permanently bent with (hairdryer?) heat? If so, this would probably be slightly more elegant than (1)
(3) Do what
greenink demonstrated here about three years ago:
http://www.ukaps.org/forum/threads/259l-bookcase-rebirth.19287/page-3 . I assume that PVC and acrylic are the same thing? (the link seems to indicate so). This is clearly the most elegant, but also the most difficult and I suspect that I would have to purchase at least one additional length of each size tube to allow for mistakes.
Any comments, suggestions or other ideas?