07-11-2012, 04:07 PM
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Nothing much to add to the good advice others have given, except to reiterate that you do not need to waste money on a kit to test GH and KH. Once you know the GH and KH of your tap water, which was mentioned earlier in this thread, it is not going to change in the fish tank unless it is specifically targeted to raise/lower it, and you are not contemplating that, nor do you need to. The pH is worth having a kit for, since it will tend to lower naturally (no issue with these fish) and you want to know how far and be able to detect any sudden changes which can indicate problems.
I wouldn't put loaches with angelfish, some loach species can be fin nippy, and the angelfish long fins are too tempting. This has to be born in mind when selecting any tankmates. Gourami are not good companion fish since they are too much like the angels--territorial. The dominant male angelfish will consider the 55g tank "his," no matter what. Izzy also gave some characin suggestions, check the profiles.