5 Gallon SW Tank... in a Terrarium

[Big MaC]

Hello Everyone!
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.

 

[MJSerik]

I wouldn't do a fish, but if you do go with a clown goby.

 

[Mebbid]

Interesting idea. I'm looking forward to seeing it happen.

If you are going to use live rock then I would skip a filter and just use a small water pump for filtration. I have a miniature one that does 70gph at max flow which would work nicely for what you are planning.

Some nerite snails will probably share the land space occasionally with the land hermits.

 

[Big MaC]

What kind of pump would you suggest? And would it be in the "pool tank" or would it be an outside component?