Recently acquired a 35 gallon tank. I'll be using regular aquarium gravel, plastic plants (for now anyways.) Its going to be set up with an Eheim 2213 canister filter, and an undergravel filter fitted with a Penguin 550 powerhead. Also a 150 watt heater. I will cycle it for 2-3 weeks using 'dirty' filter media and water from an established tank. I will make sure the ammonia and nitrites are at zero before adding fish. I will add them in groups of like fish to avoid a huge ammonia spike then finish with a centrepiece fish. The stocking list I've come up with: - 2 Amano shrimp - 3 cherry red shrimp - 8 zebra danio - 8 harlequin raspboras - 1 pearl gourami Aqadvisor says, Your aquarium filtration capacity for above selected species is 284%.Help on Filtration capacity Recommended water change schedule: 17% per week. Your aquarium stocking level is 63%. I considered the undergravel filter with the powerhead to be rated for 25 gallons on Aqadvisor. The powerhead flow rate is 145 so I figured 25g capacity is 1/6th of its flow rate. Does that sound accurate? Am I over exaggerating my filtration capacity? Removing the powerhead from the equation puts it at 205% filtration and 65% stocking capacity. I'm going to see how it goes with the 35 gallon then maybe upgrade to a 75 or 90g in a couple years. So how does that look? Do you think I have room for another centrepiece fish? How does it look from the standpoint of top mid and bottom dwellers? I admittedly have a 5 gallon with two zebra danio and two Amano shrimp. Going small was a mistake and I'm trying to rectify that mistake. Glad to be a part of the forum!