DrTim's Aquatics Guide: Beneficial Bacteria & Fishless Cycling

DrTim's Aquatics was founded by Dr. Tim Hovanec, a scientist who helped identify the actual bacteria responsible for the aquarium nitrogen cycle. That research heritage is why DrTim's products, especially One and Only Live Nitrifying Bacteria, are so trusted for cycling new tanks quickly and safely. This guide explains what DrTim's makes and how to use it.

Understanding the Nitrogen Cycle

Before adding fish, a tank needs a colony of beneficial bacteria that convert toxic ammonia into nitrite and then into far less harmful nitrate. Establishing this colony is called cycling, and it is the single most important step in setting up a healthy aquarium. Skipping it leads to ammonia and nitrite spikes that stress or kill fish—the classic cause of new tank syndrome.

One and Only: Fishless Cycling Made Simple

DrTim's One and Only contains live nitrifying bacteria that jump-start your biological filter. Paired with DrTim's Ammonium Chloride, you can perform a true fishless cycle: dose ammonia to a target level, add the bacteria, and test daily until ammonia and nitrite both read zero. This method builds a robust colony without ever putting a fish at risk.

Saltwater and Reef Bacteria

DrTim's also makes One and Only in a saltwater formulation for reef and marine tanks, along with products like Waste-Away to break down organic sludge and Re-Fresh to maintain a healthy microbial balance. These are especially handy for keeping established reef systems clean and stable.

Treating Common Problems

Beyond cycling, DrTim's offers targeted treatments such as First Defense for reducing stress during acclimation and various clarifiers and problem-solvers. As with any additive, identify the issue first and follow dosing instructions carefully rather than combining multiple products at once.

How to Cycle a Tank With DrTim's

A simple fishless cycle looks like this: fill and dechlorinate your tank, dose ammonium chloride to about 2 ppm, add One and Only, then test ammonia and nitrite daily. When both drop to zero within 24 hours of dosing ammonia, your tank is cycled and ready for fish. Do a water change to bring nitrate down before stocking.

You can find these products on our DrTim's Aquatics collection. If you are setting up your first tank and want help cycling it, stop by the shop in Cheyenne and we will walk you through it.