Before commenting on the water parameter issue, I'll offer a suggestion in response to your initial question. Given your tank size and your intention for 6-8 angelfish, one option would be just the angelfish and a good sized shoal of Corydoras. I know the tank seems large (I have a very similarly-sized 90g/340 liter with the same length and height), and the angelfish in the stores are relatively small in size, but this fish will grow to a good 6 inches in length with a vertical fin span of 8 inches. A group of 12-20 corys would be a nice combination. Plants are not mentioned, but as angelfish prefer dim lighting, using lots of wood (branches, chunks) with a good cover of floating plants would be an authentic aquascape. Play sand for the substrate will keep the corys very happy.
Remember that there may well be more than one pair form, and that can cause significant issues of its own. I'll leave this aspect.
As these will likely be commercially-raised angelfish, temperature can be lower (75-77F/24-25C) than would be necessary for wild caught fish (82F/28C +) so your option for corys is pretty well unhindered; most species do not do well at these higher temperatures. And as was mentioned in post #9, the blue ram needs this, so the Bolivian would be a better choice. I am hesitant to really suggest either ram though; a group of angelfish is quite a sight, and with their sedate cruising of the tank you will not have much in the way of empty areas. Lots of wood (especially branches and standing logs representing tree trunks) to break the area up is highly advisable. The rams will tend to get lost.
Now on the water parameters. Your pH if it really is below 7 intrigues me; I would not have expected this with the GH and KH values noted. I too feel that the GH is quite high for any of these fish. It is true that some fish species show remarkable adaptation from their habitat parameters, but this is limited. Evolution that occurs in nature takes thousands of years to alter the internal physiology of a species, and the effects of fairly hard water on soft water species is almost certainly more significant than some would like to assume. I think it is generally safer to provide reasonable parameters closer to those for which the fish is designed.
Byron.
Remember that there may well be more than one pair form, and that can cause significant issues of its own. I'll leave this aspect.
As these will likely be commercially-raised angelfish, temperature can be lower (75-77F/24-25C) than would be necessary for wild caught fish (82F/28C +) so your option for corys is pretty well unhindered; most species do not do well at these higher temperatures. And as was mentioned in post #9, the blue ram needs this, so the Bolivian would be a better choice. I am hesitant to really suggest either ram though; a group of angelfish is quite a sight, and with their sedate cruising of the tank you will not have much in the way of empty areas. Lots of wood (especially branches and standing logs representing tree trunks) to break the area up is highly advisable. The rams will tend to get lost.
Now on the water parameters. Your pH if it really is below 7 intrigues me; I would not have expected this with the GH and KH values noted. I too feel that the GH is quite high for any of these fish. It is true that some fish species show remarkable adaptation from their habitat parameters, but this is limited. Evolution that occurs in nature takes thousands of years to alter the internal physiology of a species, and the effects of fairly hard water on soft water species is almost certainly more significant than some would like to assume. I think it is generally safer to provide reasonable parameters closer to those for which the fish is designed.
Byron.
