Tanganyika Dwarf Cichlids (Tank Setup)

No experience here to be honest. I do know shell dwellers are pretty easy to keep (the look fascinating too) and they will breed readily too so might be worth not stocking too heavily on these to begin with.  Also place rocks directly on the bottom of the aquarium (put in first, rather than on top of sand as the shell dwellers digging and substrate rearrangement habit will likely topple them else). On the topic of overstocking, I believe it is right to overstock these fish (obviously this is within the filtration capacity etc... maybe it's a poor choice of words but it seems to be the chosen lingo) to minimise aggression on any one individual... I assume this also applies to dwarfs... worth some research. Im certainly no expert, this is just all i can think of that might help you from what I have seen online etc...