Category: Pond & Aquarium

Why Aerate?

Oxygen dissolves into water from the surface. In a pond with no movement:

• Hot water holds less oxygen (80°F water holds half the oxygen of 50°F water)
• Algae blooms consume oxygen at night
• Decomposing matter at the pond bottom consumes oxygen
• Fish + plants all consume oxygen

Result on a hot Kansas summer night: oxygen crashes, fish die. You wake up to a pond full of floaters.

An aerator keeps oxygen circulating. Even in 95°F heat, an aerated pond stays healthy.

Two Main Types

Sizing by Pond Acreage

Surface Aerator Pros and Cons

Pros:

• Visually appealing (fountain effect)
• Easy install — just drop it in and plug it in
• Good for shallow decorative ponds

Cons:

• Only aerates surface 2-4 feet
• Higher energy use per oxygen unit delivered
• Mechanical parts (impeller) wear out
• Vulnerable to ice damage in winter

Bottom Diffuser Pros and Cons

Pros:

• Aerates the entire water column
• Most efficient — more oxygen per watt
• Compressor is on shore — out of water, easy to service
• Works in winter to prevent ice-over fish kills
• Lasts 10+ years with basic maintenance

Cons:

• More expensive upfront ($500-2000 vs $300-800 for surface)
• Install requires running hose from shore to pond bottom
• No fountain visual effect

Install Notes

Surface aerator: tether with rope to shore, plug into a GFCI outlet, that’s it. Move it occasionally so it works different parts of the pond.

Bottom diffuser:

1. Install compressor in a vented enclosure on shore (NOT inside a sealed shed — heat will kill it)
2. Run airline tubing from compressor to pond edge to diffuser at bottom
3. Position diffuser at deepest point of pond
4. Run 24/7 in summer. In winter, run continuously to keep an open hole in ice (prevents fish kill).

Winter Use — Critical for Kansas

Kansas winters freeze ponds 4-8 inches of ice. Under thick ice, fish run out of oxygen — classic winter fish kill happens when ice covers the pond for weeks.

A diffused aerator running in winter creates an open hole in the ice, allowing gas exchange. One winter of fish kills costs more than the aerator.

What We Stock

Mr. Mc’s stocks pond aerators sized for typical Kansas backyard and farm ponds — surface units for small ponds, diffused systems for bigger water. See our Pond Supplies aisle. For sizing help on a bigger pond, call (316) 265-9930 and we’ll talk through it.

Related

• Pond Supplies Wichita
• Building a Backyard Koi Pond
• Pond Algae Control
• Spring Pond Stocking Guide

Why It Matters

The fish you stock, the densities you choose, and the management you do afterward all depend on what you want OUT of the pond:

• Catch-and-release pond — maximize fish per acre, prioritize fun fights, accept slower growth
• Eating pond — prioritize fast growth, harvest schedule, larger plate-sized fish

You can’t optimize for both at once. Pick a strategy.

Catch-and-Release Pond — The Plan

Eating Pond — The Plan

Stocking Order for Both

Regardless of strategy, follow this order:

1. Bluegill first — in spring at 55-65°F water
2. Channel catfish same year — they don’t reproduce in stock ponds, so density is what you put in
3. Bass — wait 1 full year — let bluegill spawn at least once before adding predators

For full timing/quantities see our Spring Pond Stocking guide.

Common Mistakes

• Adding crappie — they overpopulate small ponds, stunt out, ruin everything else
• Adding carp — they uproot vegetation, muddy the water, never go away
• Putting bass in too early — they eat all the bluegill before bluegill can spawn
• Not aerating in summer — Kansas heat + low oxygen = fish kills
• Not testing the water — pH, ammonia, oxygen. Cheap test kits prevent big problems.

Supplies at Mr. Mc’s

Fingerlings (when in season), feed, aerators, water test kits, algae control, de-icers — all in our Pond Supplies aisle.

Related

• Pond Supplies Wichita KS
• Spring Pond Stocking Guide
• Pond Algae Control
• Build a Backyard Koi Pond

Pick the Right Tank Size

African cichlids are aggressive and territorial. The bigger the tank, the better the social dynamics.

• 55 gallons: Minimum for Mbuna (smaller Malawi cichlids). 6 fish max.
• 75 gallons: Comfortable for 8–10 Mbuna or a small peacock community.
• 125+ gallons: Ideal. Larger groups, more species, fewer fights.

Water Chemistry Is Everything

Lake Malawi water is hard, alkaline, and warm. Most Wichita tap water needs adjustment.

• pH: 7.8–8.6
• Hardness (GH): 10–20 dGH
• Alkalinity (KH): 10–18 dKH
• Temperature: 76–82°F

Buffer with crushed coral substrate, aragonite sand, or commercial cichlid buffers. Test before you stock and check weekly after.

Substrate & Decor

Use crushed coral or aragonite sand. Both buffer your pH naturally. Plain pool sand or gravel won’t.

Stack real rock — slate, limestone, or texas holey rock — into caves and crevices. African cichlids spend their lives darting in and out of rock structure. The more cover, the less fighting.

Skip live plants for most Malawi setups — Mbuna will eat them. Plastic plants if you want greenery.

Filtration

African cichlids are messy eaters and heavy waste producers. Over-filter:

• Canister filter rated for 2x your tank size
• OR two HOB (hang-on-back) filters running together
• Strong flow is fine — these fish handle it

Stocking Strategy

African cichlids do best overstocked. Counterintuitive but true — high stocking spreads aggression so no single fish gets picked apart.

• Add fish in one or two groups, not one at a time
• Aim for 1 male to 3–4 females per species
• Don’t mix Mbuna and Peacocks/Haps — different aggression levels
• Don’t mix Malawi and Tanganyika — different water chemistry preferences

Feeding

Quality cichlid pellets sized to the fish. Twice daily, only what they eat in 30 seconds. Veggie-based food for Mbuna (they’re algae grazers in the wild). Protein for predatory Haps and Peacocks.

Pick the Right Size

For koi specifically: minimum 1,000 gallons and at least 4 feet deep. Koi grow big — adults hit 18–24 inches — and they need space, depth, and cool water in summer plus protection from freezing in winter.

Quick rule: 250 gallons per adult koi. A 1,000-gallon pond comfortably holds 4 mature koi or 6–8 juveniles.

Picking the Location

• Partial shade — direct all-day Kansas sun cooks the water and grows algae like crazy
• Away from large trees — leaves and roots are a nightmare
• Visible from where you sit — what’s the point of a pond you can’t see?
• Power access — pumps and filters need outlets
• Not at the lowest point in the yard — runoff brings fertilizer and chemicals from your lawn

Liner vs. Preformed

• Flexible EPDM liner: Custom shape, larger size, longer lifespan (20+ years). The standard choice for serious koi ponds.
• Preformed plastic shells: Cheaper, faster to install, but limited in size and shape. Good for smaller starter ponds.

Filtration — Don’t Skimp Here

Koi are heavy waste producers. Under-filter and you’ll fight algae, ammonia, and dead fish all summer.

• Mechanical filter — catches leaves, sludge, debris (skimmer + pre-filter)
• Biological filter — bacteria that convert ammonia to nitrate
• UV clarifier — kills suspended algae, keeps water crystal clear
• Pump rated to turn the entire pond volume every 1–2 hours

Kansas Winter Prep

Wichita winters freeze ponds. Koi survive under ice if:

• Pond is at least 4 feet deep at the deepest point
• You keep a hole open in the ice for gas exchange — pond de-icer or floating heater
• You stop feeding once water drops below 50°F — koi metabolism shuts down

Stocking Your Pond With Koi

Mr. Mc’s Market stocks koi in multiple varieties — Kohaku (white/red), Sanke (white/red/black), Showa, butterfly koi, metallic yellow Yamabuki Ogon, and more. See our cichlids & koi page for details.

Start with juveniles (4–6 inches) — they’re cheaper, healthier, and you’ll watch them grow into the pond. Add fish in groups of 2–4 over several weeks, not all at once.

Pond Supplies

We stock everything for backyard ponds in our Pond section — koi food, water treatments, bacterial cultures, algae control, and de-icers for winter. For algae issues, see our Kansas pond algae guide.