Bala shark asap @sAP aS@p ASAP?

i have a 25 galon fish tank but dnt no wat to put in it i would like a few bala sharks but i dont no how big they get plz hlp if i cant get bala sharks can u give me a list of fish i can get i sort of like tetra's but can some one just write a few choices of different community fish asap plz greatly appreciated.