I dont think the sd's are going to cause trouble with the lyonsi i do think like dnlb8 stated.....your going to have to over feed to get food to those little guys.
This is the reason i rehomed my metynnis fasciatus. They are bottomless pits. What i would do is find a pellet/wafer that is too big for the sd's to swallow whole, while they are nibbling on the larger pellets you can feed your little ones. I used omega one kelp wafers but yours are a but too small for them
