Tropical Fish Keeping - Aquarium fish care and resources

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-   -   75 gal tank TOO LOW of PH(4.0) (

RedBelly 01-24-2009 09:39 PM

75 gal tank TOO LOW of PH(4.0)
well im having a major issue with my ph for my 75 gal freshwater tank.i just purchased a digital ph meter bc the strips suck.the tester is reading between 3.8 and 4.0 which i know is insanely low.the only fish i have right now is a 8 year old red belly piranha and a 3 year old parrot fish.
the fish seem fine in terms of eating and appearance.

does anyone have any tips to raise my ph almost 3 full
i used to have a decent amount of drift wood in the tank whicih after researching about i figured out it lowers the ph so i ended up doing a water change and taking out all the driftwood.the water i added after doing the water change had a ph of 7-7.4 and i added about 10 gallons.that was last week and after about a week the ph is still only 3.8.i know i could just add ph up and i tried using a little bit but it doesnt effect the ph long term just went back down and plus i would need to add alot of ph up to even come close to a safe afraid of using that stuff just because the stress it would cause on the fish.

the filters im running is a dual filter emperor and a 350 magnum canister filter.i heard algae raises ph which i dont really have any in the tank but im thinkin bout getting some plants that would maybe create some algae.right now i dont have any plants in the tank.

Please Help!

FordMan 01-24-2009 09:43 PM

You can add some crushed coral to one of your filters that will help buffer the PH also i'd look for something decaying like a plant or dead fish whats your amonia level?

RedBelly 01-25-2009 11:53 AM

ok i ll try the crushed up coral in the filter.i dont know the amonia level but im gonna get a tester at the store today to see what it is.i dont have any plants in the tank and i did just do the water change last week and the gravel wasnt too bad.i dont have an excessive amount of gravel..just enough to coverthe bottem a few inches.i also have a 802 pump that keeps the water circulated.

i do feed the piranha those frozen cubes you can get at the pet store and i dont overload it just maybe a few cubes a day and he usually devoures them.before the water change where i added 7.4 ph tap water i always used to use R.O water with a ph of about 6.2 so im really stumped as to why the ph could be so low.

tophat665 01-25-2009 12:08 PM

RO water has NO hardness. Without hardness, there is nothing to buffer the PH, so it crashes. Two things to do, one of which you are already on: Crushed coral in the filters and mix some deholrinated tap water with your RO.

You can and probably should put your driftwood back in and try to stabilize around 6.5 to 6.8 for your piranha.

FordMan 01-25-2009 03:30 PM

Yeah agreed on the RO water that tends to make the ph very unstable

flight50 01-28-2009 05:48 PM

whats making your ph unstable is your kh. kh is your buffer, not gh. check your kh and tell us. with carbon injection you need at least 4 degrees more would be better as it makes the ph harder to shift. to increase your kh just add regular housold baking soda. kh is biocarbonate. my tank is below 6.0 as well at which is off the chart from what my AP kit can read. unlike you i don't have fish as of now, just plants. i have co2 driftwood and rocks that is aiding to my problem. coral would be best, you want to leave chemical out of the equation as much as possible.

tophat665 01-28-2009 10:14 PM

Flight 50 is right - Sodium bicarb (Baking soda) would work just as well as coral.

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