ammonia nitrites

I want to help out my dying plants. I recently switched out my gravel substrate to sand. I wanted dirt instead but was told that cories need sand. I'm new to keeping live plants and there's only one product near me that says plant fertilizer. The other products help in different ways. There are...

Hi there, Quick question on water parameters. I've been reading higher than ideal levels of ammonia and nitrates and nitrites. Every week I do a 30-40% water change and the 2 tanks are well cycled around 9 months they've been set up. Question is, does keeping the ammonia levels low in turn...