Any idea how I can get the pH down in my tanks. I ...

Hey, I saw that this is an old question and I hope you got it stabilized by now. The issue is in your nutrients. Most nutrients won't hold a steady pH. That is why I use maxigro and maxibloom. I have ran a reservoir for 2 weeks with no adjustments.

Keep in mind that when growing in water, the plants use hydrogen to perform nutrient exchange more than soil.. in soils or porus media, the exists a different relationship between the plants and soil biome. Plants will employ micro-organisms to generate specific molecules for their needs via plant exudates. These are carbohydrates that the plant releases into the rhizosphere to attract particular organisms to perform certain tasks..be it organisms to produce nitrate and raise pH as found in more non Woody plants(mainly annuals that prefer bacterially dominate soils ) and ammonium nitrate produced by fungi ( mainly woody plants and longer lived perennials that prefer a more acid soil. Examples are garden soils that are bacterially dominate and forests that are more fungal dominate. As a gardener we can employ this knowledge to fine tune the rhizosphere to the plants needs.. A true gardener doesn't grow plants, they grow soil! That being said the same principals apply to hydro as well, only the microbes need to be added to solution, then nurtured. Carbs and calcium are a good base for feeding the microbes. Remember that bacterially dominate raises pH, fungaly dominate lowers pH..right at the rhizosphere in the case of mycorrhiza... Hope this helps you find a good alternate solution to the solution pH issue...Happy Gardening

try cutting out the Rhiz , usually this thing brings the pH up quite a bit especially if it's old and hasnt been stored perfectly. Hope this helps ! 🚀

When roots are small and undeveloped, most water tends to be consumed or evaporated (as in the case with lots of bubblers) than nutrients consumed, resulting in a small daily rise in pH. Once roots are established then the pH should even out. If after roots become established, the pH starts dropping then that means your plants need more feeding or are getting root bound. If at any point after that the pH begins to rise rapidly then you are looking at possible problems. A fast rise in pH could indicated an algae outbreak. Continual rising pH means plant roots may be diseased or some other issue is stressing the plant causing the roots to consume more water than nutrient...similar to the way cats will eat certain types of grass when they are sick rather than the normal cat food. In that case take time to look over the plants especially the roots in hydro for darkened areas. Pythium or root rot as it is mostly called, is a hydro growers worst nightmare. It is a pathogen that affects roots and also part of the lower stem in young plants. If your plants are infected with pythium the roots will slow in their uptake of both water and nutrient. There are a number of pythium treatments available, better to ask your local hydro store for the best product. Look for one that can be used right through the grow rather than the hydrogen peroxide based products which can do more damage than good if used for a long period of time. Check the roots, if not maybe try https://www.rollitup.org/t/ph-levels-keep-rising-how-do-i-stop-this.304935/