Hey all..firstly i am new so welcome me lol. Only messing. I wouldnt say i have vast amounts of knowledge on marines but i do have a bit lol. Anyways this isnt a urgent query by any means. I have a 50G tank with about 45 KG;s of LR, a prizm skimmer (i know its not the best), 2 koralia 1's and two MJ1200's. I dont use a external filter because i only have two fish a YT (4 inchs) and a shot silk (zebra) goby. Also i do watre changes weekly. My chem is: Nitrie: 0 Nitrate: 0-under 10 (sometimes rises if i am a little late with water change) PH: 8.2-8.3 (i buffer if it drops) Salinity 1.024 (sometimes rises to 1.025). Lights: Marine white, Actinic T8 tubes (might help with colour dpeth problem to follow). I feed him New era pellets, New era flakes, and Sea weed paper. Anyways my YT can be a little strange. Firstly he is slightly pale. so doesnt have the strong yellow colour. He has always been like this since i got him. Every evening he comes out and starts appearing to flicking him self around. I sometimes get the feeling thats around feeding time in the evening. Anyone know a possible cause or is this normal?