First decision

Plan water changes and top-offs

You need to replace water, top off evaporation or service the system.

Use the whole card. The action stays attached to what must be observed and recorded, plus the nearest inference or action the current guidance cannot support.

Observe first

Name the purpose, measure source and tank water, check temperature and recent trend, and separate evaporation from material accumulation.

First action

Prepare replacement water for the actual decision and make a measured change whose volume and chemistry you can record.

Record next

Record source, treatment, volume, temperature, GH, KH, conductivity or TDS when relevant, and before and after observations.

Stop boundary

Do not use a fixed percentage as a universal rule or use top-off water to claim that accumulated material was removed.

Continue with the governing guide

Plan water changes and top-offs owns the complete method, evidence, limitations and revision history. This card introduces no separate biological claim.

Teaching card titled Plan water changes and top-offs: first decision. Situation: You need to replace water, top off evaporation or service the system. Observe first: Name the purpose, measure source and tank water, check temperature and recent trend, and separate evaporation from material accumulation. First action: Prepare replacement water for the actual decision and make a measured change whose volume and chemistry you can record. Record next: Record source, treatment, volume, temperature, GH, KH, conductivity or TDS when relevant, and before and after observations. Stop boundary: Do not use a fixed percentage as a universal rule or use top-off water to claim that accumulated material was removed. The permanent card is at moltandmoss.com/care/action-cards/water-changes and the governing guide is at moltandmoss.com/care/water-changes. — Original typography-only teaching visual containing the complete card. It is not specimen evidence.

Copy the complete card

Keep every part and both permanent links together.

MOLT & MOSS NEOCARIDINA DECISION CARD
Version: 1.0
Reviewed: 2026-08-12
Topic: Plan water changes and top-offs

Situation: You need to replace water, top off evaporation or service the system.
Observe first: Name the purpose, measure source and tank water, check temperature and recent trend, and separate evaporation from material accumulation.
First action: Prepare replacement water for the actual decision and make a measured change whose volume and chemistry you can record.
Record next: Record source, treatment, volume, temperature, GH, KH, conductivity or TDS when relevant, and before and after observations.
Stop boundary: Do not use a fixed percentage as a universal rule or use top-off water to claim that accumulated material was removed.
Permanent card: https://moltandmoss.com/care/action-cards/water-changes
Governing guide: https://moltandmoss.com/care/water-changes

This card is a first-decision aid, not a diagnosis, treatment authorization, complete method or substitute for the governing guide.

Open the portable text version or open the complete visual card.

Copy the exact accessibility description

Use this complete description when a platform provides an alt-text field. Do not shorten away the stopping boundary.

Teaching card titled Plan water changes and top-offs: first decision. Situation: You need to replace water, top off evaporation or service the system. Observe first: Name the purpose, measure source and tank water, check temperature and recent trend, and separate evaporation from material accumulation. First action: Prepare replacement water for the actual decision and make a measured change whose volume and chemistry you can record. Record next: Record source, treatment, volume, temperature, GH, KH, conductivity or TDS when relevant, and before and after observations. Stop boundary: Do not use a fixed percentage as a universal rule or use top-off water to claim that accumulated material was removed. The permanent card is at moltandmoss.com/care/action-cards/water-changes and the governing guide is at moltandmoss.com/care/water-changes.

Card version 1.0, reviewed 2026-08-12. This is a first-decision aid, not diagnosis, treatment authorization, emergency service or a complete method.