Hey everyone as you know I have a 20 gallon long reef tank, well the other day my hang on back filter sucked up some sand/gravel and I can’t seem to get it to work correctly. I am now in the market for a new type of filtration and want your opinions on what to get. My three options are a hang on back filter, a hang on back refugium, or a hang on back protein skimmer. At some point this year I will be moving to a fully set up 210 gallon aquarium, so all I want to do is buy one of those for the meantime. I understand a lot of you guys would say drill your tank or buy all of them. The only problem is moneys tight and I’m on a budget so any help would be fantastic!!!