2Hr Aquarist APT 1 is perfect for aquariums with more fish, fewer plants and is also ideal for new tanks less than 3 months old using an aquatic soil substrate. APT 1 delivers comprehensive nutrition without nitrates and phosphates for maximum algae control. APT 1 replicates APT 3's winning formula without nitrates and phosphates. This gives maximum algae control for new tanks, and optimal long term performance for tanks with more fish. This is because fish food and waste already supply phosphates and nitrates. The 2Hr Aquarist recommend all new tanks start with APT 1 for the first 1-3 months.

POWER
APT contains 5X the amount of Phosphorus (P) and 6X Potassium (K) per ml relative concentration when compared with a 50-year old European 'big brand fertiliser'. That is like having 5 shots instead of 1 in your morning espresso, if you are into coffee.

BALANCE
Simply 'more' is not necessarily better. Lower Nitrogen (N) delays chlorophyll production and induces richer colours, to a point. Nitrogen is also critical for plant metabolism. The APT formula pushes the boundaries of that trade-off, maximising colour before diminishing returns.

FORM
Similar to food labels, 20% protein or 1% Iron tells very little about actual absorbability rate, efficacy and impact. APT's components are up to 50X more absorbable, and accessible across a wider range of pH and other water parameters.