IMO,a pair of Tomato Clowns with a BTA(Enacmea Quadricolor) would be a good choice for that tank.Its not a good idea to keep different species of Clownfish in
the same tank.Although i love Percula Clowns too,BTA's arent there natural host anenome in nature(although they will often host in them in captivity).A BTA is the only anenome i would ever consider keeping in captivity.With Tomato Clowns,a BTA is their natural host anenome.If you need any advice on selecting 2 in hopes that they'll pair up,let me know.