I have a 400g reef system and I have 3 small freshwater tanks - the biggest is a 20L. I had a topoff on the 20 g freshwater tank that failed. I didn't want to spend a lot of money so I started looking for a replacement top off. The one I had was $160 new, I think, when I bought it. I ended up on Fish tanks direct and was in a hurry. It had a bunch of topoff kits on the page including the one I used to have. Then I saw the Hydros Top off kit for $88 and I thought -- sweet! So I ordered it on March 29. Nope -- did not look it up and did not investigate as it was with all of the other top off kits. It comes, I look at it and go ugh, I need a controller. I wrote to Coralvue and complained that the topoff kit was not really a topoff kit and should be called an add on or something. No one answered me. So I went to the website looking for a controller. Found one and ordered the controller 2 only. Nope, did not investigate. Got the controller and realized there was no power supply. I wrote to Coralvue again and this time Carlos answered. Said I did need a power supply so I ordered a power supply. Power supply comes and nope, I did not order the wifi powerstrip. Carlos did not take the extra step and recommend that I needed both. Anyway, I sat down to play with the topoff and the controller and realized that I had the wrong controller. I wrote to Carlos again and he said I would have to pay as I ordered the wrong controller. Upon further investigation, I had ordered the correct contoller but they put a controller 4 in a controller 2 box so they sent me the wrong one. They apologized and sent me another one. The same thing happened again - I got a controller 4 in a controller 2 box. Yup third time is the charm. Then I thought I had ordered the power strip but nope, so I finally ordered that. It came and I finally am setting it up. It won't work. I am so completely frustrated. The customer service has been less than helpful, the product appears to be terrible as the software is obviously underdeveloped, AND SO MUCH MONEY FOR A 20 G TANK!!! All I can say CoralVue is wow -- this has been one fo the worst experiences ever. I put your software and support in the same category as the absolutely terrible GHL dosers. Now, will you help me now that I have laid out how horribly I have been treated? I hope so as I would like to get this incredibly overpowered topoff working on my little 20g freshwater tank.