few Q's about discus

I have recently setup a 2ft discus tank, I have had it up for 2 months, 2
weeks of that with my discus in, I have a few Questions though.
1. could someone id these fish please, I think they are Blue Diamonds,
2. my tank is very tall, I am going to purchase another pair of Discus, but
what other types of fish would be suited to my tank, as it looks a little
bare
Water parameters are Ph: 5.8-6 temp 84F, ammonia, nitrate, nitrides all 0
picture of my discus available below.
http://briefcase.yahoo.com/sydney_chef79 in the folder marked fish.
thanks in advance
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