overstocked stocked tank<\/a> that has a large bioload, it\u2019s recommended that you multiply your tank size in gallons by 10, to find a suitable turnover rate for your tank.<\/p>\n\n\n\nSince there is no standardized calculation used by all the different manufacturers, each manufacturer may suggest a different tank size suitability for their ‘XXX g\/ph’ filter.
By using this formula, you can compare filters from different manufacturers on an equal basis.<\/strong><\/p>\n\n\n\n\n \n TANK SIZE (GALLONS)<\/td>\n | NORMAL STOCKING LEVELS<\/td>\n | HEAVILY STOCKED TANK<\/td>\n <\/tr>\n |
\n <\/span> 20<\/td>\n | <\/span> 100 g\/ph<\/td>\n | <\/span> 200 g\/ph<\/td>\n<\/tr>\n |
\n <\/span> 29<\/td>\n | <\/span> 145 g\/ph<\/td>\n | <\/span> 290 g\/ph<\/td>\n<\/tr>\n |
\n <\/span> 40<\/td>\n | <\/span> 200 g\/ph<\/td>\n | <\/span> 400 g\/ph<\/td>\n<\/tr>\n |
\n <\/span> 55<\/td>\n | <\/span> 275 g\/ph<\/td>\n | <\/span> 550 g\/ph<\/td>\n<\/tr>\n |
\n <\/span> 75<\/td>\n | <\/span> 375 g\/ph<\/td>\n | <\/span> 750 g\/ph<\/td>\n<\/tr>\n |
\n <\/span> 90<\/td>\n | <\/span> 450 g\/ph<\/td>\n | <\/span> 900 g\/ph<\/td>\n<\/tr>\n |
\n <\/span> 100<\/td>\n | <\/span> 500 g\/ph<\/td>\n | <\/span> 1000 g\/ph<\/td>\n<\/table>\n\n\n\n Most manufacturers state the g\/ph when the filter is empty with no media in place. <\/p>\n\n\n\n Once the media is in place (and it\u2019s got gunked up after a while!), these g\/ph figures reduce drastically and the real-world turnover rate will probably be around 50% less. <\/p>\n\n\n\n Nonetheless, I\u2019ve found on the whole that the filtration based on this calculation is more than adequate.<\/p>\n\n\n\n Fluval 307 and 407: Detailed Comparison<\/h2>\n\n\n\nNow for those of you who like to know every last detail, grab yourself a cup of coffee and get comfortable, we dive into all the differences and go over some handy setup and maintenance tips.<\/p>\n\n\n\n Tank Size<\/h3>\n\n\n\nThe Fluval 307 is suitable for aquariums of up to 60 gallons (227 liters).<\/p>\n\n\n\n The Fluval 407 is suitable for aquariums of up to 75 gallons (284 liters).<\/p>\n\n\n\n The 07 series also has 2 smaller filters available, the Fluval 107 and 207<\/a> that are ideal for smaller tank sizes.<\/p>\n\n\n\nType Of Fish You Keep<\/h3>\n\n\n\nDifferent fish require different levels of filtration. Some fish are particularly messy so you need to make sure your filter can cope with them. <\/p>\n\n\n\n I’ll list a few common messy fish so if you keep any of these guys you may be best choosing the 407 because it has an additional basket for filter media to help catch the additional mess, to keep your water clean, clear, and smelling fresh!<\/p>\n\n\n\n Bristlenosed Pleco<\/strong> – Although these guys are part of a tank’s clean-up crew and do a great job of eating algae<\/a> and leftover food, all that algae and food have to come out the other end!<\/p>\n\n\n\nCichlids<\/strong> – In particular large cichlids like Oscars, who are known to rip up plants, stir up the substrate, and even re-arrange rocks, all creating lots of mess.<\/p>\n\n\n\nGoldfish<\/a><\/strong> – These guys love to dig around and stir up the substrate and are known for pooping a lot, so you need a filter that can cope.<\/p>\n\n\n\nTurtle<\/strong> – If you keep a turtle rather than fish in your aquarium, you will need a much more powerful<\/em> filter to deal with the amount of waste they produce, check out my |