Double-checking my setup

[anglerkid]

I've got a 20 gallon planted tank with a sponge filter, sand substrate, and a Nicrew light. Running it for about 3 months now, but my Java Ferns are turning brown at the edges. Water params are good, 0 ammonia, 0 nitrite, 10 nitrate. Any ideas what's up?

[FinMaster]

Java Ferns can be picky about lighting. That Nicrew might be too intense for them. Try reducing the photoperiod to 6 hours or raising the light a bit. Also, check if they're buried in the sand, their rhizomes need to be exposed.

[barkleyfox]

I agree with FinMaster. Too much light can cause browning. Are you using any fertilizers? Java Ferns are slow growers but still need some nutrients, especially if your tank is low on organics.

[Finley_8]

Java Ferns can be picky about lighting. That Nicrew might be too intense for them. Try reducing the photoperiod to 6 hours or raising the light a bit. Also, check if they're buried in the sand, their rhizomes need to be exposed.

Yep, rhizome burial is a common mistake. If they're buried, unearth them and attach to driftwood or rocks instead.

[sandok]

What's your water hardness like? Java Ferns prefer softer water. If your GH is high, that could be stressing them out. Also, how often are you doing water changes?