i have a RTC for about a 3 weeks now. i have him in a low top bin base of about 40 gallon (and i guess its 20 gallon) the bin was already cycle with 2 30 gallon filter for 4 days before i got him. usually i do weekly water change but last week due to a lot a lot of homework i was busy and i couldnt do his water so i delay for a few days. about 3 days ago i found out that some of his fin look rip and little part of it is missing. so i assume its fin rot. i did a water 25-30% water change and add in API tetra. i feed him raw shrimp twice a day, he double the size from when i first got him (right now he about 4 inch) can anyone tell me if its fin rot or not am i doing the right step so far. i been doing 25-30% water changes for the last 2 days and add API tetra in. another thing he stop eating about 2 days ago when i found out he got fin rot (i think). will he be ok not eating and when u do think he will be eating again? he still very active swimming around. he look like he start to have interest in food again but he still not eating. he just check it out come up close to it and leave. i been keeping a flowerhorn for about a year now i never experience fin rot or ich before. this is my first time experience fin rot (i think) and my first time having a RTC. if anyone wonder the 20 gallon bin is for now for him to grow until he get big enough to defend himself again my koi (7-10 inch) in the 340 gallon pond. thanks for the help!!!