in my tank i have 3 fish. a tiger barb, serpae tetra, and dal molly. the molly is fine but the barb and tetra keep getting into chases. it seems the barb is trying to nip. imm a complete noob wat should i do?

Tiger barbs prefer to be in schools. Barbs, tetras, and danios are notorious for nipping others when there aren't enough of their own kind around.

If you're new to this you might enjoy these:
http://www.fishkeeping.co.uk/articles_5 ... rticle.htm
http://theaquariumwiki.com/Plants_and_B ... Filtration
http://cms.marsfishcare.com/uploads/fin ... 0sheet.pdf

I have a 15 (uk) gal tank so i dont kno if i can get a school. we ultimatly wanted an angel fish but for fear of killing him we decided to hold of on the expensive ones. if i get 1 or 2 more barbs will it stop the serpae and later angel from harrassment?

also the tetra seems to enjoy it (only second day) it goes back to get the barbs attention when it stops. why must i always get the strange animals haha j/k? is it possibe they are ok together?

well i lost the molly but i have a smokey/marble angel and a bristle nose pleco in its place. i only have 15-20 gal tank so im pretty much maxed out. but on a better note the tetra and tiger trade nips and chases. they seem to be fine and all are growing remarkably the tetra being the slowest as he was big when i got him/her (name is shelly). and dispite a few warnings on this site the angel and tiger compleatly ignore each other. relief! all is well and my fish all coexist with each other.