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i have a 90 litre tank and it has been cycled for about 7 weeks now i have done some testing on the water and my ph seems to be very high and i am not to sure wether this is healthy for the fish i have, what can i do to lower the ph???

water temp-25 degrees celsius
ph low-7.4
ph high-9.0
ammonia-0.0
nitrite-0.0
nitrate-4.0
kh-9.0

i also have an internal filter weipro 750, and only have a 20 watt flurousenct light(not sure wether this is good enough either), 300 watt aqau clear heater and two sets of bubblers.
i also have about 7 assorted plants which seem to live for a couple of weeks then gradually die.
the fish i have is;

red scat-1/2"
electric yellow-2 1/2"
lombardi-1"
black widow tetra-1"
2 neons-1/2"
2 bristtlenose-2"
2 other algea eaters (not to sure of their id)-2"


what other brightly coloured fish could i put with my little family??????

Polly,

Your 90 liter tank converts to about a 24 gallon tank. In your post, you stated that your light fixture is a 20 watt fixture. Generally, 1 to 2 watts per gallon (wpg) is considered low to moderate light. You are running at below 1 watt per gallon.

You might consider a few cryptocorene, anubias or java fern for your tank as they may tolerate the light level. Boosting the light fixture to 48 watts would give you better odds on plant survival.

http://www.tropica.com is an excellent plant site that will give you wonderful information on plants, temperature ranges, size and provide reference pictures.

Eclectic group of residents in your tank! I'm curious if the cichlids are bothering your neon tetras.

__________
"To steal ideas from one person is plagiarism; to steal from many is research."
researched from Steven Wright

From my understanding the bubblers in your tank may be depleting the CO2 from the water, as the agitation on the surface releases the CO2 for O2. If you remove at least one of them you might have better luck with the plants.

The pH seems to have a very large swing, something seems to be unstable. How does your tap water measure up? How often do you do water changes?

Alec