You are definitely correct in the parental nutrition part. The first clutch I ever raised, faired rather poorly (only two survivors) and the eggs were rather pinkish in the late stages instead of the preferable darker orange, indicating to me that they lacked nutrition. I started soaking the parents food in Selcon every other day and saw dramatic results. The mortality rate decreased dramtically (at least compared to initial results). I have 5 pairs right now (Ocellaris, Onyx, Akindynos, Tomato and Maroon) that I am just waiting to lay eggs. Wilkerson is unvaluable for sure when it comes to this process. I have never used a common sump setup althought I suppose it would be easier. I simply would add a 10-20 Gallon hang on th back filter to the parents tank and after fry were actually starting to produce enough ammonia, I would simply move it to a 20L and raise them all inside. This way the biological filter is somewhat already cycled. Please keep me updated as I will you and maybe one day we combined with everyone else can raise enough fry to satiate all the nemo lovers out there. Thanks.