Use crushed coral in a bag in your filter. But understand how it works. For that some basic chemistry helps along with some biology.
In our tank KH is what holds up pH. Moreover, most of the KH consists of carbonates and bicarbonates. These are inorganic forms of carbon as is CO2. The bacteria need oxygen and inorganic carbon. Crushed coral is calcium carbonate. Baking soda is sodium bicarbonate.
Calcium is OK in a tank at proper levels sodium is usually not except in rift lake cicjlid tanks. Crushed coral, marble chips etc. all work this way: when the water is tending towards acid, it causes the coral to dissolve and release the calcium and the carbonates. This prevents the pH from dropping. Water which is naturally higher pH will have a decent KH kevel. However, when one first adds the coral it can take a bit of time to go to work. As it does, it disappears and needs to be replenished. How much coral to add in a bag ib one's filter depends on the volume of water. I started with 1/2 cup in about 35 gal.s of water.
Baking soda works faster but it tends to drive the pH towards an equilibrium of 8.2 and to cause sodium to accumulate.
The bacteria need a few things to work and reproduce: ammonia/nitrite, oxygen, inorganic carbin, a bit of iron and a few other trace elements. Ther are a few things they do not like: light, too much ammonia and/or nitrite being frozen or made much too hot. They reproduce faster when warm but within limits. The do so when there is more ammonia or nitrite than they need. They die off when the reverse conditions exist.
There have been two major discoveries in the last two decades re cycling. But first some quick biology:
The
three-domain system is a
biological classification that divides
cellular life forms into three domains, namely
Archaea,
Bacteria, and
Eukaryota.
Basically, #3 includes all animals and people.
What this meant is there were two different microorganisms converting ammonia to nitrite in water. Some tanks have one, some tanks have the other and some tanks have a mix of both.
However, the more important discovery concerned the Nitrospira. Dr. Hovanec et. al. showed that these were the ones which converted nitrite to nitrate and not the Nitrobacter. As a result Dr. H and Marineland got patents on the nitrospira for use in tanks and the method for detecting and using them. This is why nothing but One and Only and Safe Start can contain Niitrospira.
But the real kicker was the discovery in an aquarium in the basement of a research lab that the Nitrospira were also able to convert ammonia straight to nitrate. Dr. H. had shown that when analyzing all the bacteria prest that the Nitrsomonas (ammonia oxidizers) were only 2% of the total community. That seemed like too few to me. Now I know why, the nitrospira were also carrying some of that load as could be Archaea.
This explains why Goop (and most other bacterial starter products) is not what they appear top be. The nitrobacter in them will dissapear and be replaced by Nitrospira before the tank is fully cycled. A single addition of either Dr. Tim's One and Only or Tetra's Safe Start plus a dose or two of ammonia and, in 10-14 days, you can stock a tank 100% safely. It does not take lots of additions.
As for the two scales for testing- the Nitrogen Scale (notated by the -N) and the Total Ion scale
NH3 = NH3-N * 1.21589 |
NH4 = NH4-N * 1.28786 |
NO2 = NO2-N * 3.28443 |
NO3 = NO3-N * 4.4266 |
Assumed atomic weights: H: 1.008, N: 14.007, O: 15.999
I use 1.28 for the conversion factor for
Total
Ammonia (NH3 + NH4) which is what most hobby test kits measure. Most of the ammonia in water is in the NH4 form. So, Dr. Tim's 2 ppm becomes 2 x 1.28 = 2.56. And, the 5 ppm limits he mentions for the max. for TA and Nitrite, on an API (or similar) test kit, the numbers become 6.4 ppm for TA and 16.4 ppm for nitrite.
Sorry to be so long winded. But once I began to understand the chemistry and biology involved, it all became a lot easier to manage. So I try to pass the info on to others.