Will this break down into mush after a year or two like other planted tank substrates?

I have multiple tanks where I've used potting soil that have been up 2 years. I've never used ferts either. Skip this junk and go true soil.

how long does it take for it to buffer the pH in the tank?

I purchased Fluval Stratum from a local pet store, who recommended it because of my tap water's parameters: 7.8 PH, 150 GH, and 180 KH. I added this substrate to my new tank in the evening. The next morning my PH was 6.2, maybe even lower. My test strips only go down to 6.2 PH. My GH 0, and KH 0. I have been testing the water for the past week and PH is 6.8 one day and back down to 6.2 the next. GH bounces between 0 and 25, and KH bounces between 0 and 40. I did an 80% water change two evenings ago but the next day, the water dropped back down to PH 6.2, GH 0, KH 0. This substrate was so expensive, that I hesitate to remove it and start over, but I will if water changes don't remedy the situation. Glad my fish are still in my old tank or they would probably be dead. My situation seems drastically different from other people's experience. If you purchase Fluval Stratum, I would put it in a bucket with some of your water and test it for a few days, before putting it in your tank and getting your tank all set up and planted.

I have a hard time keeping shrimp, will this help?

It's a good substrate for shrimp

Will hard decorations or rocks on top of this substrate crush it?

Not at all with my experience its the best substrate I ever use my plants look so healthy when I used it I definitely recommend it

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🌊 Dive into Vibrant Growth with Fluval Stratum!

💧 P H PERFECTED - Create the ideal environment for thriving aquatic life.
📏 GENEROUS SIZE - 17.6 lbs of premium substrate for expansive aquatic landscapes.
📦 HASSLE FREE SETUP - No assembly required—just pour and watch your underwater garden flourish!
🌍 ECO FRIENDLY CHOICE - Crafted from sustainable volcanic soil for guilt-free gardening.
🌿 UNLEASH NATURES POTENTIAL - Transform your aquarium into a lush paradise with Fluval Stratum!

Fluval 12695 Plant and Shrimp Stratum is a premium aquarium substrate designed to promote strong plant growth and support a neutral to slightly acidic pH, making it ideal for freshwater fish tanks. This 17.6 lb. bag of mineral-rich volcanic soil is perfect for live plants and shrimp, ensuring a thriving aquatic ecosystem without the need for assembly.

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Brand	Fluval
Model Number	12695
Color	Stratum
Product Dimensions	30.48 x 11.43 x 48.26 cm; 8.07 kg
Material	Volcanic Soil
Special Features	Leichtgewicht
Item Weight	8.07 Kilograms

Fluval12695 Plant and Shrimp Stratum for Freshwater Fish Tanks, 17.6 lbs. – Aquarium Substrate for Strong Plant Growth, Supports Neutral to Slightly Acidic pH

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