I took the chance getting them and have had them for some time now with my l190 and they don't seem to bother each other the 330 doesn't show any interest in them what so ever. They don't seem to mind it there's 2 pairs in there and both are quit happy but very greedy when it comes to foodDiscus and Panaque, brave choice.
Will be interesting to see how that works out, how do the Discus like the current?