Hello everyone, as you know I'm a newbie. And ill like to ask some questions:
-what's the best food to feed my ants
That depends on what ant species you have.
Most ants take sweets (sugar water, honey, hummingbird nectar, maple sirup, etc.) and protein (dead insects, egg yolk, cooked chicken, etc.).
Exceptions are Harvester ants which need seeds (bird seeds, grass seeds, canary food seeds) and Leafcutters/Grasscutters which need grass, flower and tree leaves (I doubt you have Leafcutters/Fungus growers though).
-Is this formicarium good? http://www.ebay.com/...SEAAOSw~oFXMvfo
It will do for the start but be prepared to expand the nest very very soon. If you have large ants like Camponotus or Messor it will probably hold for 2-4 months (though it may be too small for them to move properly in general), if you have a fast-growing species like fire ants (RIFA or any other Solenopsis it will hold for a month).
I'd look at pages like Tar Heel (ignore the super small nests like the atom, test tubes are way better for young colonies and you should not move your colony to ANY formicarium before they have at least 20-50 workers/the test tube looks pretty crowded), Ants Canada (their nests are expensive though) or - if you live in Europe - AntKit (their prices are pretty much unbeatable).
You can also look around in the forums, there are some people selling cheaper formicariums (like Fyre ant).
-Is Petroleum jelly good for a barrier?
That depends on the species. There's a list with which species can cross which barrier here in the forums. Some species are big enough to just walk over certain barriers (Camponontus, especially the long-legged versions, can often cross powder barriers), others are smart enough to build a bridge by sticking debris on it (Formica are famous for this) others are extremely good at finding and exploiting any weak spots in the barriers (Solenopsis).
Generally Fluon is the best and safest barrier.
Edited by Serafine, November 27 2016 - 2:29 AM.