How to bring my pH level down in my aquarium ?

I have a 75 gallon with 2 Green Terror ,2 flowerhorn ,3 convict , 1 jack dempsey , 1 pleco ,1red devil 2 jewel cichlid so I did a water test and my pH level is around 7.5 and i need a 7.0 to be stable how do i change my pH level down towards 7.0How to bring my pH level down in my aquarium ?
I agree with what JB said and besides that, with that incredible load, and the ticking time bomb stocking you have, your pH should be lowering anyways, because that's a massive bioload to be keeping in that tank, and I know it's been brought to your attention so I do hope you have plans for something like a 300 plus gallon tank. That stock cannot live it's life in that tank, no way in hell. You're Flowerhorns are going to kill off everyone and eventally one of the other or both. They just aren't community fish.



There's something else worth your time to understand here beside all that. Don't fixate on the pH. pH is over hyped by chemical companies to get you to buy their crap. What you need to look at is your GH and KH which is what drives and supports the pH reading you see. By raising or lowering the GH and KH, you will in effect raise or lower your pH as well. That's a better way to deal with pH.



Anyways, with such a HUGE bioload, regardless of the current sizes, it's HUGE in the amounts of waste put out plus very little if at all growing space allowed, your pH is going to naturally lower from bio organic material being trapped in your substrate, and it will produce small amount of carbonic and nitric acids which will slowly eat away your hardness buffer if you are not maintaning that. Older mature tanks always undergo a pH shift on the lower scale usually anyways. The pH is NOT causing any issues with your stock if they've been in there over a couple weeks. No you do not need nor have to have a stable 7.0.



Brenden is right that yes you can use Peat Moss and Driftwood and Bogwood to do this. That's a fact, but your playing with fire if you have no clue what your GH and KH is. You strip that out with the tannins leeched out from the woods, you could have a major crash in pH. You need to know your hardness levels.How to bring my pH level down in my aquarium ?
7.5 ph is not that bad. Most fish can tolerate Ph changes with no real problems.
Filtering over peat moss is the method of choice. It is continuous and relatively easy to do. The use of bogwood to decorate the aquarium has a similar effect, although it's not as easy to maintain as using peat moss in the filter.



Also http://www.cichlidhub.com has videos on cichlids if you like that stuff