I can do a 50 % water change every day , no problem, but, Rainbows need 7.0 - 8.0 ph is the rule of thumb so I achieve that, I wasn’t having problems with my fish at the 6.0 ph probably should have left it alone, but I still had not clear water.. and I thought the ph might have been causing this I didn’t know .. and parameters would not stay stable, so I was lost and people said your ph is to low raise it.. so I did…
And also I added alot of new Fluval big bio ceramic with some old in both tidal 110’s because my filters was not full of bio ceramic is why I did that, I don’t know if that had something to do with the mild cloudiness or not, but it’s been in there now for over 1 month now and I’m not touching my filters again because I was always trying to do what they do on videos DIY ( pimp your filter lol )
Like I said I tested nitrite today and they was at 0 yesterday they was around .40 I though that was good after my ph went up so the ammonia I had @ .4 and the stability I added that it would start eating the ammonia etc.
Shweee this has drove me crazy!!
Now your saying to do 50% water changes every day until I get my ammonia and nitrates Solutions probly in the next 4-5 days.. so I’m thinking lol doing that much water changes I definitely want have any nitrite.. but will keep ammonia at bay.. and nirtrats… meaning I’ll not be in the process of cycling the tank at this time. ?
Aiken pretty much told you what to do so I'll just add this: Certain fish can live in a Ph that is very acidic ( 4.0) so a low Ph is not the primary problem. Ammonia is converted naturally to ammonium when the Ph falls below 6.8 and ammonium is not toxic to the fish. Unfortunately, test kits like the API kit do not differentiate between toxic ammonia and non toxic ammonium in their test results
so if you don't know your Ph, the ammonia test results can be a shocking, OMG I need to do something RIGHT NOW!!!!! issue that in reality is no issue at all if your Ph is under 6.8. Lack of Alkalinity ( KH) allows the Ph to fall and not stay stable. High nitrates ( an acid) will lower your Ph if there is too low KH in your water. So you need to know your KH as well as your GH ( General hardness.) to know if that too needs to be addressed.
There are many varieties of rainbowfish and SOME come from waters with a Ph of 5.0-5.5 so when you say " Rainbowfish" to people, you need to be specific to the types of Rainbowfish you have since the more common ones people keep prefer a Ph of neutral ( 7.0) to alkaline ( up to 8.5) but that's not for all Rainbowfish species.
Ph values have no effect on the clarity of water. Minute particles make your water less clear and it could be from excess food, chemical consolidation of minerals in your water, phosphates, dust settling in your tank from the air, tiny bubbles from your filter, degrading filter pads, filtering pads that do not " polish" the water and is letting smaller particles through ( to name a few things.
) . I suggest you take a glass of water out of the tank and let it sit for 24 hours and see if it clears up on it's own or if you see a layer of particles at the bottom of the glass.
Lastly, if you are keeping fish that like a Ph of under 6.5, your tank will never " cycle" because nitrification stops at roughly 6.5 but definitely at 6.0. That's not a bad thing or a good thing. That just means you need to do your tank maintenance a little bit differently than someone whose water is higher in Ph so that you don't raise the PH too high and convert the ammonium present into ammonia. Cycling a tank is only "mandatory" if you are keeping fish in water that is higher in Ph than 6.5.
Hope this helps.