I'm not going to say it looks nice because you're selling it but I do like that piece of rock on the bottom right
Hey Warr, I tried to get more info on them but couldn't get much. Where would be a better place for them? How much light do they like?Are these sponges ?
They sometimes don't do to well under lights, keep an eye on them as they are the greatest natural filtration systems on the earth, so you want them to be happy
Well you can go for Seachem Reef builder.Bicarb is just a cheaper alternative.Speak to Hennie(Reef Maniac) to give you a correct dosage for your tank.
By the way Ocean, Bicarb does not have an effect on Ca as far as i know.