If Rick bought 30 guppies, Tim bought 2 clowns/guppy * 30 guppies = <<2*30=60>>60 clowns.
The total number of tetras bought by you is 4 tetras/clown * 60 clowns = <<4*60=240>>240 tetras
In total, the three bought 240 tetras + 60 clowns + 30 guppies = <<240+60+30=330>>330 animals.
#### 330