I am planning on starting up a 5 gallon SW
tank in my 75 gallon Land Hermit Crab Terrarium. However, my only experience with aquatic fish is that of freshwater, so my research has lead me to asking y'all for help.
My General Plan is to have a 5 gallon pica tank with a heater, filter (I need help with finding a filter for such a small tank), live rock and sand, a few live plants?, a small fish of some sort (any advice if this is a good idea or not?), and some marine hermit crabs!
As I said, I have little idea of what I am doing, so any advice would be great. The plan is for this small pica tank to go inside my larger terrarium so that my Land Hermit Crabs can have the best life and "beach" experience possible in a terrarium.