get the whole set
I say get the whole set, the ladder is $11 onine, the set is $17. For the small tank it is great. The canister it has is fint for a 10 gallon tank. I like how it is so neat and hangs on the back of the tank. For anything more than 20 gallons, and possibly for 20 gallons, you will want your own canister to increase the volume.