Is 1 teaspoon good for a 10 gallon?

1 teaspoon is way way too much for 10 gallons. Less than 1/8th of a teaspoon for 10 gallons - I'd suggest 1/16th.

How much do I use for a 75 gallon tank?

One level teaspoon of ammonium chloride is approximately 4.5 grams, 4.5 grams per 100 gallons of aquarium water will create an ammonia concentration of approximately 4 ppm. I would start with half a teaspoon. Check the level of ammonia, if you still haven’t reached 4ppm then add smaller doses until you do.

Typically you try to keep chlorine out of an aquarium (esp. saltwater). My goal is a fishless cycle; is there a reason to use nh4cl over pure nh3?

My thought is that the dechlorinator used in water changes should remove the chlorine put in when using the Ammonium chloride. It worked for my fishless cycle.

How much do i put in for a 55 gallon tank?

Depends follow Mr Crafty Pants on YouTube.

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Fritz Pro Aquatics Ammonium Chloride - Ammonia Source for Fishless Cycling (500 g)

Product ID: 23334640

Details

Brand
Fritz Aquatics
Item Form
Powder
Item Weight
0.46 Kilograms
Liquid Volume
1 Cups
Unit Count
17.63 Ounce

📏Highly concentrated formula

⚗️Precise ammonia dosing

🇺🇸Made in USA, pro-grade

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Description

⚡ Power your aquarium’s ecosystem with precision and confidence!

PROUDLY USA MADE - Support 100% employee-owned craftsmanship with every dose.
ECONOMICAL EFFICIENT - Just 4.5g per 100 gallons delivers a powerful 4 ppm ammonia dose—less waste, more control.
FISHLESS CYCLING MASTERY - Kickstart your aquarium’s nitrogen cycle without risking your fish’s health.
PROFESSIONAL GRADE PURITY - Trusted by aquarists and public aquariums for stable, dry, and easy-to-measure powder.
CONTROLLED START SAFER TANKS - Reduce fish stress by cycling your tank before adding livestock—test ammonia levels for perfect timing.

Fritz Pro Aquatics Ammonium Chloride is a highly concentrated, professional-grade ammonia source designed for fishless cycling. It enables the safe and efficient establishment of nitrifying bacteria in new aquariums, eliminating the need to expose fish to toxic ammonia levels. With precise dosing, trusted purity, and made in the USA, it’s the go-to choice for aquarists aiming for a healthy, balanced aquatic environment before introducing livestock.

Specifications

ASIN	B00OTH5TAQ
ASIN	B00OTH5TAQ
Allergen Information	Almonds Free
Best Sellers Rank	#50,320 in Pet Supplies ( See Top 100 in Pet Supplies ) #449 in Aquarium Water Treatments
Brand Name	Fritz Aquatics
Customer Reviews	4.7 4.7 out of 5 stars (4,256)
Date First Available	November 1, 2014
Global Trade Identification Number	00080531895009
Included Components	89500
Item Form	Powder
Item Type Name	Fritz PRO - Ammonium Chloride - 500gm
Item Weight	0.46 Kilograms
Item model number	89500
Liquid Volume	1 Cups
Manufacturer	Fritz Aquatics
Manufacturer	Fritz Aquatics
Manufacturer Part Number	89500
Model Number	89500
Product Dimensions	4.7 x 3.75 x 3.75 inches; 1.01 Pounds
Target Species	Fish
UPC	781163682493 080531895009
Unit Count	17.63 Ounce
Warranty Description	See Manufacturers Website

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¥8607

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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