So what would people recommend housing with Angels then? Aside from larger dither fish.
If you are considering angelfish, you want a small group, five is about minimum, up to perhaps seven in your sized tank. Acquire them at the same time, generally from the one tank. If you want to combine varieties, ensure they are about the same size (and still get them at the same time). Angelfish once placed into a new environment will quickly form an hierarchy within the group, and once they do, it is not usually easy (sometimes not even possible) to affect this.
Angelfish are sedate (as opposed to active swimming), cruising around together, so for tankmates you want similar quiet fish. Corys work well, and most of the smaller-sized pleco-type catfish do too. The larger-sized hatchetfish (the silver species in
Gasteropelecus and
Thorocharax) will work for the surface area provided you have some floating plants. For mid-water (in the range of the angelfish) many of the peaceful tetras can work; the disk-shaped are better than the linear generally as they have less chance of being eaten. Here you need to avoid any species with a penchant for nipping.
Got a question about wood too! What wood can/can't you put in a tank. Apart from silly things like treated pine
I found a really nice piece out on a property, it's completely dry as a bone, but no idea what tree it is off. I'm currently soaking it in the bath tub to see if anything other than tannins come out. After about 1.5hrs the water is a nice tea colour. I also poured boiling water over it several times before soaking in the tub.
Collecting wood can be a real risk, but so can acquiring wood from a store unless you know what you are getting. First, never use "soft" woods (the pine you mentioned along with all conifers are soft woods). "Hard" woods like oak, beech, maple are OK from this aspect. Second, be careful where you collect it; wood will adsorb any liquid it comes into contact with, and these may leech out months later. Collecting from a forest well away from any roads, industrial areas, etc. is best. Third, the wood must be completely dead; this means it has been separated from the living tree for months if not years (depending upon the size) so all internal saps have dissipated. Fourth, soaking and boiling may remove "critters" but depending upon how thick the wood is, some may remain. The greater risk though is from substances that may be in the wood as these can be much harder to remove.
The tannins are harmless, and even beneficial to soft water forest fish (like angelfish). It is the unseen you have to be careful over.
Byron.