{"id":29613,"date":"2026-08-02T12:39:19","date_gmt":"2026-08-02T02:39:19","guid":{"rendered":"https:\/\/www.greenaquarium.com.au\/?post_type=product&#038;p=29613"},"modified":"2026-08-02T13:18:44","modified_gmt":"2026-08-02T03:18:44","slug":"glass-co2-drop-checker","status":"publish","type":"product","link":"https:\/\/www.greenaquarium.com.au\/?product=glass-co2-drop-checker","title":{"rendered":"Glass CO2 Drop Checker"},"content":{"rendered":"<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">Keep track of your aquarium&#8217;s CO2 levels at a glance with the TNA Glass CO2 Drop Checker. This simple, reliable tool uses a colour-changing indicator solution to give you a visual readout of dissolved CO2 in your tank, helping you dial in the perfect balance for healthy plant growth without over-gassing your livestock.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">The drop checker works by holding a small pocket of indicator solution above the waterline (inside the glass bulb), which is exposed to the tank&#8217;s atmosphere through a controlled air gap. As CO2 from the water equilibrates with the solution, the liquid changes colour to indicate whether your CO2 levels are too low, ideal, or too high.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong>What&#8217;s Included<\/strong><\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\" dir=\"ltr\">\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Glass CO2 drop checker<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">CO2 indicator test liquid<\/li>\n<\/ul>\n<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong>How It Works<\/strong><\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\" dir=\"ltr\">\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\"><strong>Blue<\/strong> \u2014 CO2 levels too low<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\"><strong>Green<\/strong> \u2014 CO2 levels in the ideal range<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\"><strong>Yellow<\/strong> \u2014 CO2 levels too high (risk to fish and shrimp)<\/li>\n<\/ul>\n<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\">Simply fill the checker with the included indicator liquid, attach it to the inside of your aquarium glass (suction cup mount), and check the colour daily \u2014 ideally at the same time each day, as CO2 levels naturally fluctuate over a 24-hour photoperiod.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong>Why Choose a Drop Checker<\/strong><\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\" dir=\"ltr\">\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Provides a simple, reliable long-term CO2 reading (unlike instant\/momentary bubble counters)<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Helps prevent CO2 overdosing, protecting fish and shrimp from gas-related stress or death<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Essential tool for dialling in and maintaining consistent CO2 levels in planted tanks<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Reusable glass design \u2014 simply refill with test liquid as needed<\/li>\n<\/ul>\n<p class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"><strong>Ideal For<\/strong><br \/>\nAny CO2-injected planted aquarium, shrimp keepers wanting to closely monitor CO2 safety levels, and aquascapers fine-tuning their CO2 injection rate for optimal plant growth.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A glass CO2 drop checker with included indicator test liquid \u2014 gives a simple colour-coded readout (blue\/green\/yellow) of your aquarium&#8217;s CO2 levels to help you dial in safe, effective CO2 injection.<\/p>\n","protected":false},"featured_media":29615,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[132],"product_tag":[],"class_list":["post-29613","product","type-product","status-publish","has-post-thumbnail","product_cat-supplies","first","instock","shipping-taxable","purchasable","product-type-simple"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.greenaquarium.com.au\/index.php?rest_route=\/wp\/v2\/product\/29613","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.greenaquarium.com.au\/index.php?rest_route=\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.greenaquarium.com.au\/index.php?rest_route=\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.greenaquarium.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=29613"}],"version-history":[{"count":1,"href":"https:\/\/www.greenaquarium.com.au\/index.php?rest_route=\/wp\/v2\/product\/29613\/revisions"}],"predecessor-version":[{"id":29616,"href":"https:\/\/www.greenaquarium.com.au\/index.php?rest_route=\/wp\/v2\/product\/29613\/revisions\/29616"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.greenaquarium.com.au\/index.php?rest_route=\/wp\/v2\/media\/29615"}],"wp:attachment":[{"href":"https:\/\/www.greenaquarium.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=29613"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.greenaquarium.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fproduct_brand&post=29613"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.greenaquarium.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fproduct_cat&post=29613"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.greenaquarium.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fproduct_tag&post=29613"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}