I'm new to it all and think I got took. I spent close to $300.00 at my local pet shop and have a 10 gallon tank with a Lee's economy filter and 5 goldfish- 1 ryunkin, 1 black moor and 3 orandas. What research I've done makes me think It's already overcrowded in there. They talked me into a common pleco too, but I took him back when I found out how big he would get. I thought I'd start by upgrading the filter and stopped by Petco today to look at some clip on power filters. Advice? How do I go about switching from one type of filter to another? Should I even try? Please don't tell me to cut my losses, I'm already in love with my babies and am already noticing their different personalities.