Fish and Caring for them

Hey

Hopefully someone can give me some quick insight. I have been having issues
with my tank getting very cloudy and can't seem to figure out the issue.
The fish are Nimochromis Venustus, Labidochromis Caeruleus & Johanni.

What would be a good pH range? Temperature?

BTW they are in a 55 gallon tank.

If you could, please reply via email due to the fact that I will not be able
to read the newsgroup for a couple of days and would loveto get some
feedback and talk to some experts on the subject.

Thanks a lot
Matt