About my water tests

I had been having a problem for a couple of months with a white cloud that
just would not go away on it's own. There have been no fish deaths, I have
reduced the feeding and monitored just about everything I could test for
with my water. I have been doing 30% water changes every 2 weeks. BTW, this
is an established system.

Here are the water readings:

PH 8.0
Ammonia ppm 0.0
Nitrite(NO2) ppm 0.0
Nitrate(NO3) ppm 0.0
Total Alkalinity(KH) ppm 120
Total Hardness(GH) ppm 150
Specific gravity 1.004


This is a 30 gal setup with the following occupants:

2 - Rainbow sharks
2 - Tiger Oscars (2.5'' Long)
2 - Kissing Gourami
2 - Convict Chiclids
3 - Chinese Algae Eaters

I have a Whisper 60 (turned down) and good aeration with a bubble wall for
the kids to play too :-)

I guess the questions are, why has this bacteria bloom taken so long to go
away and since I have such hard water, is that and my ph going to be an
issue for these guys for the long term.

Thanks :-)

-James