So my mrs bought herself a 19l fluval chi outta p@h. Now the light stays constantly on! I know this isn't good for my fish, it's been on for 3 days. Can't find the receipt anywhere. As the light and filter are one unit you can't choose which you want on. I'm debating setting a timer for 12 hours on an 12 off. Chances are I'll destroy any good bacteria so just wanted to run it past you guys an gals 1st.