I just ordered a web monitoring system for my Aquaponics system. It will send you a text message or email when things are not working correct. You can monitor 6 different things a set alerts based off them. I picked it up off eBay to save some money.
Sensaphone Web600 Monitoring System
I got it with 2 weatherproof temperature sensors.
I will need a flow detection
and low water level detection.
I know there are home grown solutions but I have enough going on and this system is mature has data logging and only uses a few watts of power.
My wife thinks it is funny I have system monitoring before I have my system done. but it is important to keep the fish alive for this all to work.
I collected 120 gallons of rain water last night.