Have a 35G and I plan on having 1 angel, 1 keyhole, 1 GBR, 1 dwarf gourami. I already have 3 otos, 8 penguin tetras and 6 leopard cories. I was going to get a Bolivian ram but like the look of GBR better. They are labeled as blue rams at my LFS. How much harder are they to keep? My ph is around 7.2.