Looks like nute burn on tips of leave. Room temps can get pretty chilly but not the water. Way to go with the heaeters. are they in separate containers or the same res ? Hot spot from the light but I don't think so.

If they are separate containers, take some out and add PH water.

Let us know what happens.
LOC NAR on probation Reviewed by LOC NAR on probation on . frazzled looking skunk #1 I'm currently growing three plants - two skunk #1, and one oasis. now, the one oasis and one of the skunks look just fine so far, but the 'frazzled looking skunk' is beginning to look, well, frazzled. it's taller than the other two, and yellowing around the edges at the top...currently in the first week of flowering, and want to save it if possible. temps in the water are an even 23C / 73F (thanks to an aquarium heater), and room temps are around 26C /78 F daytime, and an admittedly chilly 13C Rating: 5