Angels are fine with smaller fish, but you need to buy them when they are babies. For best results, fully stock your tank then get your angels. I had five in my old tank, but bought them when they were tiny.

For the first week or so they chased everyone but then that settled. Now they only things they chase is each other. Its better to have more as this spreads out the aggression. They will generally only nibble each other as they are very territorial.

As for your cat fish, I noticed you were saying he only comes out at night. I bought some red led spot lights from my LFS for around £7 each. I have them positioned throughout the tank and I turn them on at night.

It makes the tank look superb and the fish cant see it. Also, they can no longer see you so you get to see the tank in a completly different way.

If you have never tried this I would recomend it. A worthwhile investment :-)