It's been 15yrs since I had a tank and decided it was time again. What I have is:
20g Topfin standard
Topfin 20 HOB filter
Fluval 205 filter
1 CoraLife 65w 6700k light
1 15w 18000k Power Glo light
Substrate for plants, 1" to 2" depth
Building CO2 generator and will bubble through filter
Assorted plants (?)
10 Neon Tetra (Jumbo?)
2 Zebra Danio, 1 male, 1 female
After cycling tank using a friends bio mass as starter all was joyful. Water was within parameters.
Fish are acclimated and appear healthy and happy.
Feed once a day with Tetra Color crisps and once a week with bloodworm's.
I started adding rocks this past week and suddenly my Nitrite went up to 5.0, Nitrate up to 10. I use a API Master test kit.
I cleaned and soaked rocks one at a time. Rinsing between washes with hot clear water.
Could the type of rock have done this?
I put in Obsidian, granite, and Petrified wood.
I removed all carbon from the filters.
Water changes of 15% to 25% biweekly.
With the Fluval 205 I get water recirculation 5 times an hour, more or less.
Every couple of days I decrease the water flow for the day and then increase it back to full throttle. An old timer at the local store says that this gives my fish's what its like in the wild with rains increasing water flows of their home waters. Who knows, they seem to still shoal the same and seems to be of no harm.
So, thats me and my fish's story. Hope to have some photos soon. Any comments and/or advise is always welcome.