Question: Filter size in relation to tank?

[virago]

I posted a question before with no response. It was titled, "Which canister filter should I get?" I am re-wording it with specifics.

If I have a 55 gallon U.S. aquarium and the water level is not full can I use a filter that says "up to 45 gallons?"

Here is what I am thinking...

Rena FilStar XP1 Canister Filter up to 45 gallons​

Rena Filstar xP2 Canister Filter up to 75 Gallon ​

I am also thinking about... ​

EHEIM 2232 Ecco External Canister Filter up to 35 gallons

EHEIM 2234 Ecco External Canister Filter up to 60 gallons

I've been reading so much on here and want to make the right purchase. If the filter is too powerful will the current will be too strong? If the filter is not powerful enough will it cause "dead space?"

 

[kinkyoto]

I'd go for the Rena FilStar XP1 Canister Filter up to 45 gallons, only because it seems like the perfect size for the job.