2 filter sponges in hob or sponge and biomax?

[actik]

Pretty much what the title sais, would 2 sponges be better for bacteria and cleaning? or do those little bags of bio max rocks make that much of a difference? my aquarium has lots of sand and rocks

 

[EricR]

Depends on your true goal for the HOB but I vote sponge and/or filter material just for mechanical filtration since your rock likely already has sufficient bacteria.

I run Tidal 110 HOB on 40 gallon tank (no sump) and use sponge, pond filter, and Matrix (bio rubble) but only use the Matrix since it came with the filter. *previously I ran two smaller HOBs with no bio-media and never had any issue with high residual nutrients

...but every situation is different

 

[actik]

Depends on your true goal for the HOB but I vote sponge and/or filter material just for mechanical filtration since your rock likely already has sufficient bacteria.

I run Tidal 110 HOB on 40 gallon tank (no sump) and use sponge, pond filter, and Matrix (bio rubble) but only use the Matrix since it came with the filter. *previously I ran two smaller HOBs with no bio-media and never had any issue with high residual nutrients

...but every situation is different

thanks, i was just sort of thinking to myself whats the purpose of the little bio media rocks if i already have lots of rocks and sand as hardscape. also figured maybe the sponge would hold even more beneficial bacteria?

 

[EricR]

... also figured maybe the sponge would hold even more beneficial bacteria?

Probably could,,, but I blast mine out with hot tap water to clean so likely not in my case,,, doh!