looking good, well done on breeding them.
do you have texas holey rock? doesn't that harden the water and raise PH? i may be wrong
also, why no sand or fine gravel? they are earth eaters after all and it's a big part of their natural behaviour, including when breeding. I'm not having a go at you... just curious. Obviously they are happy because they are breeding but i have never kept geos without at least a fine later of sand for them to sift.
Your water change regime sounds perfect to me. very similar to what i did with geos.
keep up the good work, i love seeing leucos being bred.
matt