My gh is about 30-35 drops and kh about 25 drops with api gh & kh test kit, so do I need to lower them for healthy aquarium?. I want to lower gh and keep that kh high to avoid ph to crash If I Do lower gh ,any effect to kh and ph?
I’m not 100% sure because I have never tested gh/kh (I know I know). But like ph I think gh/kh is more important to be stable than perfect. I’ve had one of my flowerhorns in my untested gh/kh water for years and as far is I can tell he’s fine. (Can you share some pics of your flowerhorn)?
Depends on the fish you have in that super hard water i'd think. On the test paper you get with that kit, it tells you how many drops for certain fish types. I have the same kit. My tap water is 20 KH, 20+ GH, and I dilute with about 75% RODI water to get mine in the 6-8 range, proper for the fish I have in the tank. My PH holds a steady 7.4 week after week, on all 7 tanks. You might consider diluting with RO water, or even distilled is fine. Both should be PH neutral (7.0) and 0KH/0GH, which would average out depending on your mix.
Fist you should probably look up what numbers you should be having with the fish you have.
Actually what I see for Flowerhorn, you should probably fix your water. I see PH 7.0-7.8, KH 10-12, GH 10-16 is the range people say. I don't know your specifics, but you can lower that. I'd do it slow. Like 5-10% water swap out per day as to not shock them if you have fish in there.
Flowerhorns are tough. How does he seem in your tank? Is he healthy and happy or does something seem off.
Chasing pH and hardness, unless you really have to, is not great. If he is happy and adjusted, I would leave that water be
I agree just leave it be. Problem with these tests is that they do not tell you anything about actual magnesium or calcium content which raises hardness. Just that your water is hard. But there is a lot of reasons for this and combos therein. I drove myself crazy trying to narrow down my micro make up of my water to the point my report from my water company was quite inaccurate and it started consuming my time.
It would really really have to be off the charts for it to matter imo. Like I’d probably test some well water or a cabin with natural water source etc.
It’s more about consistency anyways. My plants tel me what they need. Fish are less symptomatic to GH/KH specifically, but more so the PH that sometimes correlated with it, but not always....
Point being, unless extreme, keep your PH stable and consistent more than chasing some number or ‘hardness’.