owhh..now let me tell bout my experience...
i breed tiger barb for my subject..

tank preparation

i use daun ketapang,and net.the net we put on the aquarium floor to avoid the broodstock eating the egg..

identifying male

for identifying the male,on the male mouth,for the mature one,the mouth will appear red in colour...the colour are bright.one more to identify male,the dorsal fin will have red colour a little bit.dis is for common and green barb..for albino you can onli see the mouth.

identify female

the abdomen were bigger,disk shape body,colour a little bit dull.

spawning

eventually, tiger barb will make couple in aquarium and go far away from their community,like human maa..want to date also go to romantic places...hehehe
if you want to breed...i suggest give them blood worm.
also,you can put aside male and female in different aquarium for few days..then put them in spawning aquarium each one couple for each tank size 1 feet.dun forget to put the net under the floor.make room for egg to fall and make sure the broodstock cannot seize the egg..
they will make faster under acidic water,thats why i use daun ketapang..but dis is not wajib..they will also mate if they are ready.onli my observation.
they will swim side by side for spawning and u can see the egg fall from female abdomen...they are finish after u see them tired...hehehhe..
emm...then u can put the brood stock back to maintainance tank and clean the water in spawning tank..sifon the feaces or other thing except egg...sifon the water half,put new water and put metelin blue for caution measure..to avoid the fungus.after one or two days u will see the lutsinar larva on the floor or aquarium wall..somtime they mlekat on the net we use..make sure the net have 1/2 cm hole..ok?
give moina or green water from tilapia culture..but rotifer is the best...heheh..
will post my barb larva barb picture later on..