I actually feed my rednet cable through a block to indirectly power the lamps. (This is partially left over from working with vanilla redstone.) I've gotten in the habit of this as you can read redstone from a block away and successfully hide the rednet cable in the wall or under the floor without leaving anything visible.
This is one area I really miss the old redpower. The lamps and cable just worked so well for lots of things...
I looked in AE, and actually have a breeding pair of tetras. Just before calling it a night, I put together a fish feeder. Now I just need to build a tank in the jungle and get things going. That will be tomorrow's project though.
That also explains how you address each lamp, without the signal affecting it's neighbors. Nice!
Eh, if you're in SSP, you could always add Project Red - Illumination, unless it requires other resources/ores/etc not available in AS. I don't see how adding another lamp would be a game breaking change...not like adding Chisel which gives cheap moss balls, or MPS and it's associated OP'ness.
Why breed for the fish? Just to get more? I suppose it's something I've been wanting to get into too, just have no idea where to start.