5G is really very small.. good choice not to run a chiller.. think ice probe would work better or even placing the tank in an air conditioned room..
You can get most zoas but better to get small frags then colony.. even your LS will be very limited most likely sexy shimps will be your best choice.. for fishes, 5G is kinda small to live in...
good to get some mushrooms or ricordeas... Rics and zoas would certainly add alot of colours to a small little tank like yours!
Around USD119.99
For a tank your size, not much is too much..
lol.. start slow bro.. slowly see if the corals are able to adapt to your tank condition. Do note that for a small tank, do very frequent water change to prevent the parameters to go off the idea level too much. In a small tank, a small swing in parameter can be a HUGE disaster!
CoolWorks' IceProbe Small Aquarium Chiller (IPAC-50W) is the perfect cooling solution for small aquariums and insulated fish egg hatching, bait, and specimen tanks.
50 Watts of cooling power
Compact size
Easy bulkhead installation
Quiet, efficient & reliable
Optional temperature controller
120V
The Aquarium Chiller is a complete water cooling system. It includes the IceProbe, the nut and silicon washer for bulkhead installation, and a power converter with six foot cords on each side. The Aquarium Chiller can be easily installed in any orientation through a 1.25 inch hole into siphon overflows, pre-filters, sumps, or aquarium walls, or suspended with a bracket or lid over the top of the aquarium.
The chiller cools continuously when powered. In most aquarium implementations, the CoolWorks Proportional Temperature Controller is added to regulate the IceProbe's cooling power. TEC-65 controller is designed for tropical water aquarium environments, with an adjustable temperature range of 65ºF to 85ºF.
http://www.marinedep...ceprobe-ap.html