Discoid Roaches vs. Crickets, Dubia, and Mealworms: A Cleaner Staple Feeder

I've fed a lot of different insects to a lot of different animals, and when people ask me what to build their feeding routine around, my answer is almost always the same: a discoid roach (Blaberus discoidalis) staple. Not because roaches are trendy, but because once you've kept crickets dying and stinking in a tub for a few months, the appeal of a clean, quiet, long-lived feeder becomes obvious. This is the honest case for discoids over the usual feeders — what's genuinely better, and what gets oversold.

What a discoid roach actually is

Discoids are a tropical roach native to Central and South America, in the same family (Blaberidae) as dubia. Adults reach 1.5–2 inches with a flat, oval, glossy tan-to-brown body. They go through incomplete metamorphosis — egg case carried internally, live-born nymphs, then molts up to adult over several months. They have wings as adults but are not real fliers; you'll see them crawl, not take off across the room.

The trait that makes them so forgiving is that they can't climb smooth vertical surfaces. A plain plastic bin contains adults with no sealed lid and no greased rim. You'll find sources confidently calling them "good climbers" — that's wrong for smooth glass and plastic, and it's exactly the quality that makes a discoid colony low-stress to keep.

The nutrition, told straight

Here's where I have to correct the care sheets, including the one I migrated this from. Discoids are a high-protein, moderate-fat, soft-bodied feeder — roughly 19–21% protein and 5–7% fat as fed, around 60–65% moisture, with low chitin that makes them easy to digest and gentle on smaller animals. That digestibility is real and it matters.

What is not true is the frequently repeated claim that discoids have a "favorable" or "balanced" calcium-to-phosphorus ratio of around 1:2. A 1:2 ratio is the opposite of favorable — it's phosphorus-heavy, and reptiles need roughly 1:1 to 2:1 calcium-to-phosphorus to avoid metabolic bone disease. Discoids, like crickets, dubia, mealworms, and nearly every other feeder insect, are phosphorus-heavy. The one common exception is black soldier fly larvae, which are genuinely calcium-rich.

So the practical rule stands no matter how well you gut-load: dust discoids with a calcium supplement before feeding. Gut-loading improves the overall package, but it does not fix the calcium gap. Anyone telling you discoids don't need dusting because of their "good ratio" is repeating a myth that can hurt your animal. For the underlying reason this matters, the Merck Veterinary Manual's overview of reptile nutrition is a solid non-commercial reference.

Discoids vs. the other feeders

Vs. crickets

This is the matchup where discoids win most decisively. Crickets are loud (the chirping is relentless), they reek, they die in waves, and dead crickets foul a tub fast — which means smell, bacteria, and constant restocking. Crickets also have a harder, higher-chitin exoskeleton that some animals digest less easily. Discoids are silent, nearly odorless, live for months, and are softer-bodied. Nutritionally they're comparable to slightly better. For most keepers, switching off crickets is the single biggest quality-of-life upgrade in the animal room.

Vs. dubia roaches

Nutritionally, discoids and dubia are nearly interchangeable. The real differences are legality and breeding speed. Dubia breed somewhat faster, but they're restricted in Florida, where discoids are an accepted feeder. If you're in dubia-banned territory, the choice is made for you, and you give up very little.

Vs. mealworms and superworms

Mealworms and superworms are convenient and cheap, but they're harder-bodied (that tough head capsule), and superworms in particular are high-fat (around 15%) — a treat, not a staple. Lean on them as the whole diet and you trend toward obesity and fatty-liver problems. Discoids are leaner and softer, which makes them a far better daily staple.

Here's the rough comparison I keep in my head. Treat these as approximate as-fed figures — they swing with diet and source, but the relationships hold:

Every one of these is phosphorus-heavy and needs calcium dusting. None has a "balanced" ratio out of the box.

Cleaner, quieter, and lower-maintenance

The day-to-day reasons keepers fall in love with discoids:

• ◆Odor. A healthy, properly ventilated discoid bin is essentially odorless. Their waste is dry and compact, not the wet, sour mess crickets leave behind. Any real smell means too wet, overcrowded, or rotting food — a husbandry problem, not the roach.
• ◆No noise. No chirping. If you've ever had a cricket bin in a bedroom, you understand why this alone sells people.
• ◆Longevity. Discoids live for months and tolerate a wide range of conditions, so you restock far less often and lose far fewer to die-off than with crickets.
• ◆Lower allergen load. They shed less airborne dust and frass than crickets, which matters in homes where someone is sensitive to feeder-insect debris.
• ◆Containment. No climbing smooth walls, no real flying, no jumping. They stay where you put them.

Cost over time

Per insect, discoids can cost a little more than crickets up front. Over time they're cheaper, because they don't die constantly and because a small colony breeds at home. A self-sustaining bin turns a recurring pet-store expense into a one-time setup, and they store well in bulk thanks to their hardiness. The math favors discoids for anyone feeding regularly.

Transitioning a picky animal onto discoids

Some animals balk at a new feeder at first. What works for me:

• ◆Mix, don't swap. Start at roughly 70–80% the old feeder and 20–30% discoids, then shift the ratio over one to two weeks.
• ◆Use movement. A discoid wiggled with feeding tongs triggers the hunt response in reluctant eaters.
• ◆Size it right. The feeder should be no longer than the space between the animal's eyes — small nymphs for geckos and juveniles, larger nymphs and adults for bearded dragons, monitors, and big frogs.
• ◆Feed at the animal's hungry window and be patient; picky eaters often come around once the novelty wears off.

When you're ready to start a staple supply or top up a colony, All Angles Creatures stocks healthy discoid roaches in sizes from small nymphs to adults, so you can match the feeder to the animal.

The honest bottom line

Discoids aren't magic, and the "perfect calcium ratio" claim is marketing folklore — you still dust. But on the things that actually decide whether a feeder is good to live with and good for your animal, they win: high protein, soft and digestible, nearly odorless, silent, contained, long-lived, legal in more places, and cheap to breed. Build your routine around a dusted discoid staple, rotate in variety, and you'll spend less, smell less, and feed better.

New to roaches? Start with my full discoid roach care and breeding playbook, and if you keep a blue tongue skink, see katydids vs. discoid roaches for blue tongue skinks. The full feeder insect library covers the rest.