hi Nav
ive been doing bonsai for about 3 years now so i do have some basic knowledge that i could give you that might help
In my opinion i don't like gravel,i rather not have it as for that reason that i can't see if the soil is moist or dry so i would loose the gravel.if the treehealthy it might good idea to repot anyway as some purchased trees like this one can be quite root bound, i know this from experience, and since figs grow quite rapidly it could be in need of a repot. i don't know exactly were your going with this tree but if you were aiminng to style it into a slightly larger tree it might be a good idea to, if you do repot into a larger pot or if you like it size just a loose trim on the root ball. But that is totally your decision as to what you were planning for your tree.
I would say that a tree of this size and the size of pot the tree is in, it should be watered regually to keep it moist as small trees in small pots will dry out alot faster than larger ones. the reason that it takes very little water to run out the bottom is because it is a small tree so it would come out faster and only a small areafor water to go so a little bit of water is going to come out of a small pot quick. there isnothing wrong with this i don't think and proberly means it has a good draining soil which is what you want to stop water logging. just as long as the soil is wet the tree will be happy and figs arn't really a problem they can with stand a lack of watering fine. To water it you should obviously be wanting the water to be going into the soil so water slightly above the tree witha watering can
not a mister. Many people who start off in bonsai think you have to be delicate with watering but using a mister is not good as it does not provide nearly enough water. So make sure you water just like any other normal pot plant. Also to water a small tree like this it is good to submerge it in a bucket of water that will submerge it deep enough that the water level will come up the trunk base and leving it untill bubbles stop rising, this indicates that all the small airpochets have been waters and water has reached all the areas of the inside of the pot and the roots.
Figs inside is more acceptable then other species of plant, so it is considerably fine that have it there is enough morning and or afternoon sun like you say. But i keep all my trees outside as it is the best coditions for a tree,
remembering that it is a tree. So if you wanted best growth out of it it would be good to keep it outside in good sunlight but if you are wishing to keep inside which is fine, you could bring it out for a period of a few days outside aswell as you should probably keep it inside nomore than two weeks at a time with figs i find.
Bye the way i didn't mention that the pebbles propobly wont stop water penetrating the soil too much as water can just run through them.
i know that was alot of blabber that i gave you but i hope you find something helpfull form it
Have fun with your tree.
Hugh
