I recently removed my AC power heads/wavemaker (koralia), AC return pump and AC skimmer. I have all DC pumps now and my tank which had been good at 75-78F (chiller kicks on at 78F) is now running 70-72F which is a little lower than i want. Looking for suggestions for a "modern" heater to drop into my sump that i can plug into my chiller (will turn heater on when too cold). I have a couple of 300w visitherm heaters from when i lived in Michigan 25 years ago, but dont think they will fit my sump with the rollermat, skimmer and return pump, as i need something shorter in length.