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First planted tank. I was at the LFS today and asked what type of filtration to use on my 37 gallon tank and they recomended A 70 HOB. Reading posts on these forums most people have canisters on a tank this size.

I will plant the tank moderatly and stock with a cleaning crew and a dozen tetras and 2 angels.

Does anyone have suggestions for me.

I also have the impression that you can use a canister filter to diffuse Co2 from a DIY setup is this correct?

What would be a great filtration system for this tank?
 

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I also have a 38 gallon, maybe its a 37 (same as yours). I'm also fairlly new to this site and the 38 is my first planted tank, although I've started two smaller ones since.

You are right, that most people on this site would recommend a canister filter and express passionate opinions about which is the best canister filter for you. :) Others will report success using a HOB filter.

I still have the HOB filter on mine, but am also running a used Eheim canister filter and hope to remove the HOB at some time, when I'm sure the canister filter is working correctly.

For me, the main reasons for switching to canister filter are 1) less clutter on back of tank 2) less aeration of my CO2 into the air through the turbulence created by HOB filter. 3) I am experimenting with some floating plants, which move around too much with the current generated by HOB filter.

I'm finding that I can pretty much keep my drop checker green (meaning I have enough CO2) with my DIY CO2 system, so that is not really an issue. Plus, the HOB filter actually diminishes the potential that I might get too much CO2 in tank at night, because of the aeration that it creates. Also, HOB filters are cheaper and some people find them easier to maintain.

In short, I suggest reading the various arguments, weighing the pro's and con's, and choosing what you think is best for your situation.

Hope this helps,
 

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Fresh Fish Freak
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It's easier to minimize CO2 loss using a canister filter, that's why most people prefer them on planted tanks. It's also nice to be able to hide heaters and other in-line equipment, too. If not dosing CO2, though, HOBs are still excellent filters.

I'd go with a Rena XP3 or Eheim 2217 for your 37gal, personally. Or an AquaClear 110 if you want to go the HOB route.
 
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