grout any good

Allo peeps.
I'm new to tank keeping. 5 weeks ago I was given an old 25ltr green tank, that I cleaned up to look brand new.
I put 6 mollies, a little cave and a olaf(frozen) statue.
I gave it to my 3 year old for her birthday, but after she got bored with it, I found myself obsessed with it.
I've just bought a 65ltr and have built a polystyrene background.
now I planned on coating it in concrete, that I knew I had in my shed.
when I went to get it, I saw it had gone off in the bag, so I used a bag of anthracite coloured grout that I had knocking about instead.
1. Is this ok?
2. Should I seal it?
cheers

 

Hi, and welcome to fishlore. First off mollies need a 30 gallon tank to thrive so a 25litre is overstocked with 6 of them in it, secondly do you know about the nitrogen cycle? And lastly, to answer your question concrete is not safe for fish and will heighten your pH. I hope this helped!

 

The concrete will eventually cure fully and will stop affecting ph.

I don't know about the grout unfortunately.

 

Just noticed there is already a thread on this.

 

Just noticed there is already a thread on this.

Thanks!

 

no problem.

 

Thanks.
I know the 25ltr tank is small, which is why I making the background for a 65ltr.
By the way. I now have 20.
Fry all over the place, so I'm in a rush to it finished now.
I decided to paint over the grout with acrylic paint and then seal the whole thing with G4.
I'm guessing that's fine as its for pond sealing?

 

good for you for upgrading your tank size!