which should i use

  • We are currently upgrading MFK. thanks! -neo
I wouldn't say it's a stupid question but a lot more detail to put the question in context would probably be helpful.
 
Well I've heared cement u have to do more water changes at first to lower ph .....I think you have its advantages it will help with the boyancy of foam...I used drylok....I'm liking it so far I dropped a piece of stryofoam nothing happened if it would of been cement maybe it would of broke...

Don Juan
 
But with cement doesn't it break back down into mush because of being soaked in water for so long? Then u would have to recoat it I think with drylok ill cut the background jus barely fit with a squeeze to keep it placed

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Cement should not break down under water, no. It does tend to cause PH issues though; if you have the choice I'd use drylok.

Don't underestimate the bouyancy of foam; it weighs almost nothing so every gallon of water you displace with foam will result in about 10 pounds of bouyancy. For a decent sized background this adds up very, very quickly and wedging it in place won't be sufficient - it will likely need to be glued down unless it's quite thin.
 
I was affraid of that I have tank with fish in it and no place to store them right now so the best glue I can do really is half the tank only
Why do people choose drylok over cement besides easier to work with

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I know u used drylok but with cement how does it cling to Styrofoam since there is no gritty surface

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I have seen great styrafoam carviings to make 3d backgrounds. Look them up there are a few on the site
 
MonsterFishKeepers.com