I have a 20 gallon with a pair of clowns and some coral. I have a torch, gsp, and an unknow coral that came as a bonus when I ordered the torch. I also have a rock flower anemone. I cycled my tank with a sponge filter but realized I needed more flow for the coral. I had an underwater power head filter I put in for the flow but someone said I don’t need the sponge filter so I took it out. I’m scared that I may have messed up by taking out the filter and fake decor because now I have brown or red algae on sand and heater. My gsp won’t open now and I’m worried I messed it up. My salt is at 1.023 my ph was at 7.8 struggling to get to 8. Ammonia 0 nitrites spiked and nitrates at 20. Temp is 78 I also have an emerald crab and three blue legged hermits