40 gallon breeder suggestions. No sump, canister or HOB allowed

[bela]

Hello.

I am looking for suggestions for a filter for a 40 gallon breeder.

No water can flow outside the tank and back so no canister, hob, etc are allowed by wife.

Sponge, undergravel, internal (please recommend brand/model)...?

Thanks very much in advance

[Galabar]

Sicce Shark ADV.  I've got two of them on a 40 breeder.

 

[mynameisnobody]

If those were my options, I’d go sponge filter, simply for the fairly cheap price tag even with an air pump. 

[JettsPapa]

Two or three sponge filters spread out along the back of the tank should be fine.  I like to keep things simple.

[Ben P.]

I'm gonna be the one to throw out the odd idea here.... I just put a matten filter in a 20 long and love it. I use a small power head as opposed to a air lift.   On a 40 breeder use a corner matten filter and you can also hide your heater behind there as well

[Zeaqua]

Personally, I’d go sponge filter. The co’op’s are great, but if you’re particular about getting tiny particles out, there are fine ones on Amazon. For a 40, I’d recommend either 2 mediums or 1 large.

[Ben P.]

@bela also what you're going to stock it with matters a lot