I am very stressed out - and fearful that I will be laughed at. I am the typical clueless mother of 3 , ages 7, 2 and 3 months. Last year in December we bought the typical fantail goldfish from ***Mart and put it in a bowl and mom was stuck cleaning the bowl every other day because goldfish are so poopy and so I bought a little 5 gallon set up with carbon filtration and bio wheel to put silly fantail in. Happy mom with clean tank and very happy kids. The smart addition of a live plant and fun aquatic toys made us all happy. Added snail for interest and a little brown algea control. Water was too warm for goldfish running between 76 and 78, my husband speculated because of flourescent light. Not happy family to discover one and then second dead goldfish on Christmas. More gold fish - dead goldfish (looked up symptoms on internet - looked like sepsis). NO MORE GOLDFISH. Snail was fine. Treated tank with something suggested for bacteria - waited then added a single platy we named Mattie. Lonely platy gets guppy tankmate, again happy. Now here we had a simple 5 gallon standard set up with our platy, guppy and snail and a little more algea than I cared to have, but warm water - what did I expect. Cleaned tank walls as often as I could - that's the least of my worries. I saw my cousins huge 25 gallon or better tank and got starry eyed. She has the cutest crabs that do little kung fu moves. I had to have a crab - so I went to her choice of pet store. Ready to bag crab when I ask - will it bother tankmates??? Oh yes it will eat my snail - can't have that, I have small kids and envision their horrified faces at sight of eaten snail. I must have a bottom feeder for tank to help with overall eco-system. Their suggestion - a YO YO Loach. Dissappointed in just one new fish we decide to get something else - kids choose an ugly blue painted tetra. Call cousin to report crab is a no go, and she warns that tetras can be unfriendly from her personal bad experience. New tank mates - no problems for one week until today. Fish were fine all the way to last night as of feeding time - I am sure because we just moved and after I cleaned the tank I was staring at them admiring their healthy appearances - still okay this morning until this afternoon comes and my son says that the snail is on the guppy - sounds unusual and there is our fantail guppy with no fins and no tail at the bottom of the tank pretty much dead. Oh god where is the platy - stuck on the intake like one of those fish at ***Mart! Kids are horrifed and can't stop staring at it like a car wreck on the interstate. Quick call to cousin and she reiterates her tetra warning. Where is the tetra - in tank front unharmed and looking fairly guilty. I am mad. I loved that we had successfully kept healthy fish for so long. It was an achievement, and the kids were attached. The guppie and platy were lovingly swooped up and sent off to toilet heaven and the ugly blue tetra had made me so mad that it went too. I was so frustrated and sad and felt so dumb for messing up a good thing. I was also baffled. How could that tetra eat my fishes fins gone in mere hours and I not noticed. I blamed it on myself and being busing taking care of a 2 year old and 3 month old all day. Off to store to get new fish with kids. We pick 2 reliable platies and due to lack of guppy selection have also brought home a molly and inspect fins and tails carefully, perfect looking fish. Add fish to tank with no threat of tetra. Two minutes go by - watching new fish from a few feet away. What is this - oh the YO YO Loach has come out to see what's up - gosh I've never seen him swim that much and he's very fast. He attacks one of the platies. Relentless he chases it around the tank nipping at his fins and tail... he indeed is taking chunks of fin and tail. I am horrified and quickly yell for my husband. Husband is pissed. It takes fifteen minutes for us to turn the entire tank upside down - trying to net the aggressor that caused so much stress. Angry husband flushes YO YO Loach. I am sad and frustrated! There is not enough good fish help in any store. I have made countless mistakes and though I've not been buying pricey fish, spent countless dollars on this hobby. Now I look at my little (but cute) dishelveled tank with its crooked plant and uneven gravel and wonder where to go from here. I have a traumatized platy - someone tell me - will his fin and tail grow back where he was savagely nibbled? He seems a little skiddish now (understandable). I know so little and I am worried about the platy and the future of my tank. My kids love the fish and we want to keep the tank going. I am busy any tips for colorful passive tankmates or should I stop with what we've got also, advice on fin recovery would be greatly appreciated. I see cute fish and creatures and never know what will really work in my tank. Now I am terrified of making another mistake and also really feeling like a bad person for flushing the tetra and even for the loach because it was not really his fault. Please be forgiving of my mistakes this was one of the worst experiences I've ever had with pets and I feel awful. Please help... :sad