Nothos will spawn in sand although I don't like it. Keep the layer very thin to avoid pollution problems. You can take the fish out and gently store the sand and see the eggs come out or you can siphon the sand into a bucket. The sand will settle fast and then take a net and do a figure 8 briskly in the water and you should collect alot of eggs that way. I still believe bare bottom tanks painted flat black on the outside bottom and a bowl of boiled, rinsed peat is the best.
A fluval is too much even dirty. Just use old fashion corner filters with a bit of floss at the bottom and then small gravel on top of that to the top of the filter box. Makes a great little biological filter. Have the air running slow so you can almost but not quite count the bubbles coming out the lift tube. Sponge filters work too. No power filters.
The new fish are doing well. I really like the Limias. He is sending another population of the Limias and some of the red picta. Another friend is sending more blue gularis and returning some of my old zonatus FINCA to me -- that is a spectacular fish. I am happy about that. The lacortei are all sexed out now and the arnoldi and gave me great sex ratios. Let me know on the kafuensis --- Sat. after this one?