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what kind of filtration should a 75 gallon get i was thinking 2 emperors

For the Hang on Backs, you will need a flow rate of 10X, I think the 2 400's would be close to that. IMO it should be fine, as HOB types, you might want to do some price checking, to make sure you can't get a canister for less than the price of two hobs. Canisters only need a 5x rating.

2 emperor for 85$ but which would you recommend

For easy of operation, I would go with the hob's, first, you can servce each one individually, so if theres a problem you don't lose all your bio filters. Just one point to consider.

I d personaly go with a canister[XP3] and 1 HOB[ac110/500]..
I run an XP3, and 2 ac500's on my 80g

i know what a canister is but what is a hob?

Hang on Back. Also known as HOT (Hang on Tank). For the longest time I thought a HOT filter was one that was stolen:D . Live and learn, eh?

i think thats stupit buying a canister when it cost 119$ when 2 emperor's cost 98$ shipping /h which is weird if its is the canister any better

There are pro's and cons to all types of filters. Canisters are nice, some performace is better than Hob's. They are easily hidden, so if you have a concern about esthetics, they are not visible, unlike the Hob’s. For sound, some are quieter than Hob's. So for someone who has these concerns, 20 bucks is not a big difference to pay. In my business, I am often surprised by ppl who will spend thousands of dollars more than they have to, just to get exactly what they want, not something that will do the same job. So for you, the Hob's might be fine, for another person, it might not be what they like, that does not make it "stupid", they are merely paying in order to get what they want.

2 hob can generate 800 ghp together while a conister thats 120 dollors can generate 200-300 ghp whould a person have to buy 2 to make the same ghp as the hob

Originally posted by Fuzzy
For the Hang on Backs, you will need a flow rate of 10X, I think the 2 400's would be close to that. IMO it should be fine, as HOB types, you might want to do some price checking, to make sure you can't get a canister for less than the price of two hobs. Canisters only need a 5x rating.

I am not 100% sure of the XP3's rate, however you would need a rate of 5X your tank, 5x75=375 gph for a canister. When I wrote this post, I checked my pricing here, and it was cheaper for me to get a canister, and one small HoB, than two Emperor 400's. My price on the 400's was about 90 each, and I can get a canister for 130, plus I have a spare Hob so I don't need to buy one.

Originally posted by Fuzzy
. My price on the 400's was about 90 each, and I can get a canister for 130, plus I have a spare Hob so I don't need to buy one.

i can get 2 emperor for 98$ at petsmart

i did more research and i found a canister that was 100$ its a xp3 does anyone know what the ups and downs of canisters are

Originally posted by daoscar
i did more research and i found a canister that was 100$ its a xp3 does anyone know what the ups and downs of canisters are

VERY good filter i have had one a few weeks and love it, it is so simple to maintain and setup. Flowrate is 350gph one of the strongest out there.For $99 you cant go wrong try this place http://www.bigalsonline.com www.bigalsonline.com
Canisters are the way to go so efficiant,and easy to work with, not seen,hold alot of media,......9.1 liters... I looked around for weeks and decided on XP3 and i made a very good choice.

what do you think gman 2 emperors or the xp3 for my 75 g