Hello new to the board. I just set up my 10 gal tank 5 days ago and i made the mistake of getting 6 fish fish right away. 3 of them died. I have a ph test kit and an ammonia test kit, they seem to be ok. Their are 4 fish remaining. 2 are tiger barbs, and the other 2 are gouramis. one of the gouramis tail is a little bitten on by the barbs. I know i made the mistake of getting fish right away, but now that i have some what are some suggestions?