this is odd

300 gph for a 55 gallon doesn't seem like too much filtration to me

I filter 200 gph on a 29 gallon

The more filtration the better, in my opinion.

What kind of filter is on your current tank, or will this be your first tank?

Then, I'll try to answer your question

I'll try to explain, I just don't want to go into a bunch of stuff that you already know!

I run an XP3 that is rated for 175 gallon tank but only has a 350 gph rating. Thats only twice an hr. I have it on a 75 gallon tank which gives me 5 times an hr. Does a bigger tank not need to cycle through the filter as much?

My 55 gallon has 2 AC 70s, rated together to be 600 gph at maximum. I have a goldfish in there. It cycles through 10 times an hr.

It really depends on the fish i think, but the Aquaclears have an adjustable flow so usually I turn them to about halfway and run it as 450 gph. The low flow option supposedly makes the water in the compartment filter multiple times before returning to the tank. I'm trying this way because of a situation that when remedied I will put the filters at full strength.

You can't overfilter a tank, the more the better unless the current becomes to much for your fish.Its not a scam, if anything they're helping you out for when you upgrade your tank.

ii run 2 30gal HOB filters in my 30gal. One on each side. The more the better and it dosnt hurt the fish so why not?

Wouldnt you want the highest amount of clean air in your house, Or just a good enough amount?

like what was said about the current, you just want to make sure the current is okay for your fish.

Most of the time, current is not an issue, some schooling fish actually seem to enjoy chasing each other through currents.

Just be careful about some aquatic frogs and stuff that can't handle currents! Do some research about the type of fish you intend to keep.

In my opinion: 99% of the time more filtration is better

But everybody has their own opinions! :idea:

On my 75g rainbow tanks I run:

Eheim 2026 rated for 92g, 251 GPH
Emporer 400 rated for 80g, 400 GPH

That's 651 GPH or 10* x turnover per hour

*Based on actual volume of 64g, not net volume of 75g

Rainbowfish need good, clean water and a nice current.

Roan

my 20g long tank i will be using two 20g hobs on it because its so long, one at each end. like whats been said before, you can't over filter a tank, just make sure the current isn't too strong. the more times the water passes through the filter, the more chances the good bacteria has to clean out the icky chemicals, and the more chances the filter media has to clean out muck, so you end up with cleaner water.