How do you like the OCTO ? I have heard nothing but good about that model. I have one internal to the sump on my 90 ( 10 K in so far and no coral yet after at least 3 yearsI'll respond to all comments. I take everyones opinions and options seriously and in consideration. I do the research. I use a marineland internal filter rated for an 80 gallon tank I'm pretty sure. And i use the jebao wavemaker. Along with the octo classic 100 skimmer. I've been ready for the expenses and knowing how much things will cost. I know that this is an expensive hobby. But I'll buy the important expensive stuff especislly if its almost "mandatory" but if I can just stay in a low budget then i will. I've had saltwater tanks for about 3-4 years. I just started off small and I thought it was soooo much easier. This is my second time at having a 55 gallon. My last one, the tank was damaged and I had to repair it when i got it, but it just made me super anxious because I was renting an apartment at the time. Now I'm in a basement if less space in a sense but more opportunity to do things the right away.