03-24-2012, 09:02 PM
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Hello! A canister is always best but Aside from that, you have several things to address. Heat source, lighting and nutrients. A heater is mandatory if you want to keep tropical fish.Common plecos, being semi-tropical will survive in colder waters between 65-70 but will not be truly comfortable. Proper lighting, preferably something better than t5, t8 bulbs is also mandatory if you want your plants to flourish. You will also need fertilizer. Just like grass, aquatic plants need to eat too. One last thing to consider is mixing trops and goldfish. Goldfish live in a lower standard than tropical fish as they are less intelligent and cope with poor water conditions more easily. That being said, you should care for them with the same respect as any other fish. They also swim in a spastic manner which is stressful to tropical fish. While it can be done with success, it's best avoided. Do some reading and you can succeed. Hope this helps.