After four decades beside aquariums, I learned that the cheapest fix is the problem that does not return. This manual shows you how to read the water, reuse what still works, and spend less without giving your fish less.
The manual
Water, filtration, plants, algae, fish health, food, setup, breeding, ponds, and money. Ten sections, arranged around the problem in front of your tank. Each method gives the materials, the current prices, exact steps, and an honest note on what it will not do.
Read the nitrogen cycle and true water volume first. Then open the single chapter that matches the problem you see today. You never need to read everything at once.
Illustrated ebook · 381 pages · 2026 edition
Cloudy water. Returning algae. Weak plants. Stressed fish. Replacement cartridges. Conflicting advice. The Manual places the relevant method, measurements, safety limits, current prices, and sourcing notes together. Read the two foundations first, then open only the chapter you need. Forty-four chapters have never appeared on the channel, and future revised editions are included.
The complete package
Instant PDF · Pay once · Yours to keep
The math
This range applies when tank-and-pond methods, several tanks, or an equipment purchase you no longer need are relevant. It is not the result every reader should expect.
The cover’s $1,400 figure is a ceiling, not a promise to every reader. The Manual’s Savings Ledger shows the arithmetic line by line. Use only the rows that match your tanks, pond, equipment, local prices, and purchases you were genuinely about to make.
What’s inside
Fifty-two numbered methods across ten practical sections. Each chapter gives you a short explanation, materials with current prices, exact steps, an honest limitation, and the cost arithmetic. Read the cycle and true-volume foundations first. After that, pick the chapter that matches your aquarium. You do not have to read the book from beginning to end.
Use these chapters when you want a route from a symptom to a decision. Every method includes What You Need, the Method, What This Will Not Do, the Math, and a source note where one applies. The reference sheets keep quantities and costs close at hand.
Water · 7 chapters
Filtration · 6 chapters
Plants · 7 chapters
Algae · 6 chapters
Fish health · 6 chapters
Food · 4 chapters
Setup and scape · 5 chapters
Breeding · 4 chapters
Ponds · 5 chapters
Money · 2 chapters
Plus: Quick-Start Road Map, Savings Ledger, Materials Sourcing Sheet, and Dosing and Volume Charts.
From YouTube
These are public comments left beneath Isamu’s teaching before publication. They are viewer comments, not reviews from people who bought the book.
The Manual is new, so this page does not present comments as buyer reviews. They show why viewers asked Isamu for a reference they could keep nearby.
“I can’t wait for your book!”
The request was simple: take the explanations that disappear into a video feed and put them somewhere a fishkeeper can search when the water changes, a plant weakens, or a fish begins acting differently.
“Thank you so much for sharing your family’s knowledge with us and please get that book wrote!”
The Manual answers that request with exact amounts, ordinary materials, costs, limitations, and fifty-two methods. Forty-four chapters have never appeared on the channel, so this is more than a transcript of free videos.
3,000+ subscribers. 140,000+ public channel views.
The audience came for calm, detailed aquarium explanations. The book keeps that same voice, then adds the measurements, sourcing notes, chapter order, and reference sheets that are difficult to fit into a single video.
About the author
I have kept fish for more than forty years in Niigata Prefecture. Almost every serious mistake I made came from moving too quickly: treating the symptom, changing several things at once, or trusting a label more than the aquarium in front of me.
That is why every chapter follows the same shape. You see the materials, the amount, the method, the common failure point, the honest limit, and the cost. This is not an instruction to keep fish in one supposedly “Japanese” way. It is a practical reference for observing your aquarium carefully and making one informed change at a time.
Forty-four of the fifty-two chapters have never appeared on my YouTube channel. The remaining chapters add the measurements, sourcing, limitations, and arithmetic that a video cannot hold. Read two foundations first, then use the book according to the problem you need to solve today.
The purpose is simple: help you slow down, measure the water you actually have, make one change, and watch the aquarium before changing something else in the same week.
“Almost every mistake I have made in forty years was made in a hurry.”Watch the channel
Order the manual
Get the illustrated PDF immediately after Gumroad checkout. Read it on your phone, tablet, or computer, search for the chapter you need, and return whenever something changes. Pay once, keep it forever, and receive future revised editions at no extra charge.
Illustrated PDF · 381 pages · 52 methods
A practical freshwater reference for water, filtration, plants, algae, fish health, food, setup, breeding, ponds, and spending. Read two foundation chapters first. Then use the Manual according to the problem in front of your tank.
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FAQ
Yes. Read the cycle and true-volume chapters first, then open the section matching your current problem. You do not need to rebuild the tank. After those foundations, go directly to water, filtration, plants, algae, fish health, or whichever issue you are facing. The chapters are written to help without dismantling a stable setup or changing several variables together at one time.
No. Read two foundations, then use the PDF as a searchable reference whenever a problem appears.
Yes. Beginners get an ordered start; experienced keepers can jump directly to detailed methods.
No. Forty-four chapters are not on YouTube, and every chapter adds measurements, limits, prices, and sourcing.
A searchable illustrated PDF for your phone, tablet, or computer, delivered after checkout.
No. The Manual is written for freshwater aquariums and ponds.
Yes. Future corrected and revised editions are included at no extra charge.
Last call
$29 once. Instant access. Fifty-two methods, gallons and litres, honest limits, and forty-four chapters unavailable on YouTube. Keep it beside the tank.
Get the complete manual · $29