Okay, I have just begun my research into these lovely creatures so I have a lot of questions! 1.) Would a appox. 30 gallon tank be appropriate for 2/3 of these lovelies? The dimensions are 30x12x18. 2.) What is the best substrate to use and how deep should it be? 3.) What food is the best and what supplements are needed? How often/how much? 4.) Any pictures of you setups would be greatly appreciated! Thank you so much in advance!