Draw an aquarium Mutation Tier List

Mutations are the second lottery inside Draw an aquarium. After you draw and roll a rarity, the fish can also appear as Gold, Diamond, or Rainbow—or with no mutation at all. Official copy calls those three out by name, and the Rainbow Fish badge (about ~4.3% class among players) proves Rainbow is uncommon enough to track but far more reachable than SECRET rarity (~0.2% class). This page ranks the mutation ladder, explains keep-or-redraw calls, and shows how shinies interact with the rarity tier list.

Mutation tier ranking

Tier	Mutation	Why it ranks here	Keep advice
S	Rainbow	Top advertised mutation; Rainbow Fish badge	Always keep on Epic+; strongly keep even on Rare
A	Diamond	Mid-high shiny; clear upgrade over Gold	Keep on Rare+; lock on Legendary+
B	Gold	First exciting mutation most players see	Keep on Epic+; situational on Common/Rare
C	None	Baseline fish	Judge purely by rarity + stars

S-tier — Rainbow

Rainbow is the mutation trophy. It is visually loud, tied to a dedicated badge, and should be treated as a permanent resident whenever the base rarity is usable. A Rainbow Legendary or Mythic is a centerpiece. A Rainbow Common is still a collector piece—park it while you decide whether to keep a novelty earner or free the slot after you own duplicates.

Because Rainbow Fish sits near the mid-single-digit percent class, you should see it more often than SECRET, especially as you draw volume increases. Volume plus luck beats staring at one sketch for an hour.

A-tier — Diamond

Diamond is the serious shiny for income-focused tanks. Prioritize Diamond Epics and above. If tank space is tight, a Diamond Rare can displace a plain Common/Rare without guilt. When Diamond lands on Legendary or Mythic, stop redrawing that concept and move to filling other slots.

B-tier — Gold

Gold is the on-ramp mutation. It teaches you that shinies exist and usually offers a noticeable bump over a plain fish of the same rarity. Keep Gold Epics and higher. Gold Commons are replaceable once your tank is full of better earners, unless you are still early and need every multiplier.

C-tier — No mutation

Plain fish are not failures. A plain Mythic still beats a Gold Common for long-term money in most progression plans. Use rarity first, mutation second, star quality always. See draw 5-star fish so you are not rolling beautiful shinies on messy low-star art.

Draw an aquarium mutation showcase reference

How mutations stack with rarity

Think in pairs:

Base rarity	No mutation	Gold	Diamond	Rainbow
SECRET	Trophy	Mega trophy	Mega trophy	Ultimate flex
Mythic	Elite	Elite+	Premier	Premier
Legendary	Staple	Strong staple	Premium staple	Premium staple
Epic	Solid	Preferred	Preferred	Keep
Rare	Early	Situational keep	Keep if space	Keep for badge/flex
Common	Filler	Temporary	Temporary	Collector / temporary

Exact money-per-second formulas can change with updates, so treat the table as relative priority, not a frozen spreadsheet. The direction is stable: higher rarity wins ties; higher mutation wins within a rarity.

Badge and collection notes

• Rainbow Fish (~4.3%) — specifically tracks the Rainbow mutation. You can earn it without ever seeing SECRET.
• Secret Fish (~0.2%) — rarity badge, not a mutation badge. A plain SECRET still counts.
• Legendary Catch — rarity breakpoint at Legendary or rarer; mutations are gravy.
• Masterpiece — 5-star draw quality; mutations do not replace neat eyes and clean shapes.

If you are badge hunting efficiently, run high-star draws with upgraded luck so you can trip Rainbow and Legendary goals in the same play block. SECRET remains its own marathon—secret fish.

Farming tips without scripts

There are no verified public scripts for Draw an aquarium at research time (Scripts Hub). Mutation farming is a legitimate loop:

1. Upgrade luck so each draw has a better rarity floor; shinies on better rarities matter more.
2. Expand tank capacity so you can keep multiple mutated fish instead of deleting your only Gold.
3. Place income decorations so every swimming fish—mutated or not—pays harder.
4. Maintain a high star average; low-effort scribbles waste rolls.
5. Decide a keep rule before you draw (example: keep any Diamond/Rainbow Epic+, keep Gold Legendary+).
6. Spend future codes into luck/tank/decor, not impulse clutter. Prep via how to redeem.

Skip unknown executors that promise forced Rainbow. Read executor safety if someone DMs you a “guaranteed mutation” paste.

Keep / sell / redraw heuristics

Always keep

• Rainbow on Rare or better
• Diamond on Epic or better
• Any mutation on Mythic or SECRET

Usually keep

• Gold on Epic or better
• Diamond on Rare when you still have open slots

Usually redraw later

• Gold Common in a full late-game tank
• Plain Common/Rare after you own multiple Legendaries

Never panic-delete

• Your first Rainbow of any rarity before you own a duplicate

Related pages

• Tier List Hub
• Rarity tier list
• Make money fast
• Decorations
• Draw 5-star fish
• Secret fish
• Getting Started
• Codes
• Scripts
• Tools
• Updates

Mutations are the sparkle layer on Draw an aquarium’s rarity spine. Chase Rainbow for the badge and the flex, respect Diamond as premium income, treat Gold as a welcome bonus, and never forget that a plain high rarity in a decorated tank still prints money while you wait for the next shiny roll.