As above I also use a net to get the sand out.. It can ruin your net but oh well its easier than mucking around, also be careful not to grate the sand up against your glass it will scratch it..
You do realize there is no reason to take the sand out? You could add the lime chips in a stocking and hide it at the back of the tank or stick it in the filter or something like that? Would save alot of work thats all..
Brichardi are cool fish thats for sure, the parents will breed then the babies will grow up and they will also help guard any future spawn's so you will have many many generations in the same tank eventually The tank will look a bit empty initially though.. One pair of small fish in a big tank! lol
And yeah I was a bit annoyed about the brichardi/pulcher thing, we understand they should be kept apart, but eventually once it filters down people will mix them all up and the nice yellow ones will be lost, although im keeping my yellow ones and thats all ive got so mine will be pure, so will afrikans So its not all bad!