So if Bogwood is a no could you add some aquarium peat to the filter. Temp needs to be 24-26C, gH 4-12, pH 6-7. If your ram falls sick, even though you look after them well and they looks fine, it is nearly always due to incorrect water compostion. Since it is usaualy water which is too hard which causes the problems (rocks increase the gH of the water), a way in which to lower the gH is to add some petrified wood (bogwood) and a layer of peat to the filter.