Planted Tank 101: A Beginner's Guide to Getting Started

Black beard algae doesn't appear at random - it appears where something in the tank is already off. You can trim it, spot treat it, scrub the hardscape. All useful. But leave the CO2 fluctuating and the organic waste building up, and it comes straight back. Here's where to start.

Most low tech planted tanks don't fail because the plants are fussy - they fail because five setup decisions were made on instinct rather than logic. Tank shape, lighting, substrate, fertiliser, and filter flow. Get those five right upfront and the tank quietly runs itself.

Most fish keepers assume converting to a planted tank means buying some plants and a brighter light. It is a bit more involved than that. Substrate, fertiliser, CO2, flow and livestock all work differently - and understanding how is why the conversion either succeeds or becomes an algae tank.

Most first-timers stare at a CO2 setup like it's a small bomb attached to some houseplants. It isn't. A pressurised CO2 system for a planted aquarium has six parts, a sensible order of installation, and one measurement method that actually tells you if it's working. This is that guide.

Your plants looked fine on planting day. A week later, they're dissolving. Plant melt in a new tank isn't one problem - it's five. Some will sort themselves out. Others never will. Know which one you're dealing with before you start changing anything.

That brown dust coating a new tank's glass and leaves? It's diatoms, the first algae to colonise fresh setups. Most aquarists blame silicates or tap water and reach for RO filters. The real cause is tank immaturity, and it fades on its own. Here's how to speed that up.

Four things determine whether your first planted tank works or slowly fills with algae. Substrate, filtration, lighting, plant choice- get the order right and most beginner disasters never happen. I have watched enough of them unfold from the couch. Let me save you the trouble.

Every planted tank already has CO2- just not much of it. Whether you need a pressurised cylinder or can skip it entirely comes down to one honest question: what do you actually want to grow? Low tech and high tech are both valid systems. They just ask for different things.

Eight types of freshwater algae. Eight different upstream problems. Most aquarists panic and reach for the algicide- what they should do first is look closely at what they're actually dealing with. Green spot algae is not the same problem as black beard algae. Name it first. Then fix it.