I have a 60g. cube tank I will be doing a Tanganyika set up. I would like to make it mostly shell dwellers, but I would also like to keep the 2 Calvus, 1 brichardi, and a Juli. I was thinking of 4-6 shell dewellers, the othe fish are still very small. Will I run into problems or will the shell dwellers hold their own? Also where can I get some shells from the lake.