I'm real new to plants, but in short, what would cause the mature leaves of a Hygro Willow to turn brown and die prematurely? I know it probably depends on many factors, but in general, there is plenty of new leaf growth, but after reaching something close to maturity they turn brown right away. Perhaps this is a common indicator of something that I should look into first?

Z

You might need to consider dosing with ferts. All the databases I've searched on ''care'' for Hygrophila angustifolia say it needs a ''nutrient rich'' environment. Some have even said it may need lots of nitrate...

I would advise that you use something like seachem flourish or something instead of dodging water changes, cause I know YOU wouldn't do that. lol

Some say high light and some say moderate is fine, but most say that care is ''easy''..whatever that means.

hmm it could have a little to do with PH and also you may have a lack of nutrients

stick with anubias plants, these plants are hardy, need low light, and though they are slow growers, in time, the plants will tank over your entire tank