My temperature is becoming an issue. In the mornings I'm seeing temperatures about 79.5, which I didn't think was that big a problem because until yesterday the hottest it got in the tank was about 80.8, a bit over a degree at the most extreme swing. Yesterday when I got home from work the tank was 81.9, almost two and a half degrees from the hottest to the coldest.
I have a Coralife digital thermometer and I've heard some people complain about their accuracy and wandering readings even when things are stable. I tested it last night in ice water and it read 32.3 so it would seem the thing might be decently calibrated. I haven't messed with the heaters for almost a week so I'm at a loss to explain why my temperature would suddenly be rising. I guess this rambling question is about temperature ranges, how closely should I be trying to maintain the temperature. Is a two degree swing from early morning to mid afternoon acceptable? Should be trying to maintain a tighter range?
As a review I have a 55 gallon tank with a penguin 300 filter. My heaters are a 50W Visi-therm Deluxe and a 100W Visi-therm Stealth. I realize this is at the bare bottom of the 3-5W/gallon rule of thumb but my room temperature is about 75 and ideally I'd like to keep the tank at 79. I'll be replacing the 50W with a 150W or even 200W stealth later this year before winter. Here is how my tank is set up:
As another question, feeding my fish. My platy and sole surviving neon tetra decimate the food when I put some in. I'm concerned that my bottom dwelling cories might not be getting enough to eat. Should I buy some sinking pellets for them?