Wall Mount Thermometer
Thick green slimy algae, yuck!?
I have a 5 gallon tank with 3 medium cory catfish and 3 medium platties. All the fish are healthy, and I don't think I over feed. It has a good filter (5-10 gal outside mounted), a heater (always in the "green zone" on my thermometer). The hood-light is on most of the day, it has to be b/c it's one of the few things entertaining my bedridden grandma. There is a moderate amount of natural light also.
The gravel (medium round), walls, decorations and even leaves of the (real) plants are constantly getting covered in gross green slimy algae. If I didn't scrub the walls and ornaments and stir up the rocks regularly it would cover everything. How can I get rid of it?
I see two reasons why you're experiencing the algae right off the bat from your description.
1. Your tank is overstocked. Corydora catfish are schooling fish that thrive in groups of at least six, but will do well in a group of four. I don't recommend anything under 20g for a group of four of these.
2. The tank lights should not be on for more than 8 hours normally, but even less if you're experiencing algae. The natural light should suffice for those hours where the tank lights are not on. Only keep them on for around 5-6 hours a day.
I recommend you put a towel over the tank for a few days and don't feed the fish in that time, and keep your tank lights off. The algae will die off due to the lack of light and food. You should also purchase an algae scrubber to clean the tank walls daily - even if you cannot see algae.
I also recommend returning all of those fish. One 5g tank is only suitable for one betta fish. I'm sure your grandma will be at ease knowing the fish are happy instead of making them suffer and stressed for the purpose of entertainment.
Round Wall Mount Transparent Indoor Outdoor Thermometer
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