wnce2001 power led blinking red

There's 3 led's on WNCE2001. Each one means something different. the lan port shouldn't be red though. 

if its the power led is blinking it means: unit is busy. try resetting it.

If the power led is solid red it means its not getting enough power. try a different power adapter

if the lan port is red it means your connection to the router is poor. 

So which led is it? 

have you tried a different power supply?

have you tried a reset? push and hold the reset button until the power led blinks. 

here's the support site

https://www.netgear.com/support/product/WNCE2001.aspx

It is a bit of an older device. If its just for an aquarium you could replace it with a wifi extender that has ethernet capabilities. There's everything from cheap n300 extenders to expensive triband extenders.